How should I upgrade my MTB?
With only about $1,000 to spend, I'd like to upgrade my old entry level MTB, It's a Trek 4300, everything on it is original, 19.5 inch frame.
Front Suspension: RST Gila T8 w/preload, 100mm
Wheel: Bontrager Camino, 32-hole rims w/eyelets, machined sidewalls
Tire: Bontrager Connection Trail, 26x2.0"
Shifter: Shimano EF50, 8 speed
Front Derailleur: Shimano C050
Rear Derailleur: Shimano Alivio
Saddle: Bontrager Select Basic
Headset: VP-A76C-TK, 1 1/8" semi-cartridge, sealed
Brakeset: Tektro V w/Shimano EF50 levers
Just as a heads up, this is actually the info that's on the Trek website, I didn't actually double check to see if mine are the same, seeing how mine is not the 2009 model. Also, I'm looking to hopefully move over to tubeless tires. Thanks a bunch for all suggestions, ideas, thoughts, feelings, and love 
As the others said, you can get a seriously good mountain bike for $1,000.
If you just want to upgrade, I would spent little on it. The first thing should be adding are disc brakes. Mechanical ones will be just fine. Disc brakes in general are a huge improvement over rim brakes.
Go to a bike shop if you want to do this. You want to make sure the brakes mount correctly.
People Love These Road Bike Parts:
FSA Gossamer Front Rear Silver Road Caliper Brake Set, FSA Energy Front Rear Black Road Caliper Brake Set, TRP CR950 Carbon Cantilever Brake Set Front Rear, TRP EuroX Carbon Adjust Cantilever Brake Set Front Rear, SRAM Red Front Rear Brake Set, TRP EuroX Mag Cantilever Brake Set White Red Front Rear, Avid BB7 Mountain Bike Brakeset 160 Rear and Front With Black Avid FR Levers, SRAM Red Black Front and Rear Brake Set, SRAM 2012 Red Road Bike Caliper Brakes Brakeset Front Rear, Schwinn Front and Rear Caliper Brake Set Type LS 28 Vintage Very Nice, Sram Rival Brake Set Front and Rear Black, YAMAHA XV535 VIRAGO XV 535 1987 87 FRONT BRAKE SET MASTER CYLINDER CALIPER LINE, 225G New Road BIKE Brake Set Front Rear Calipers RED, Raybestos Front Brake set for Dodge PGD842M, FORMULA ORO K24 HYDRAULIC DISC BRAKESET FRONT AND REAR 160 160 A SET, AVID ELIXIR 5 BRAKESET FRONT REAR G3CS 160MM 185MM ROTORS, BRAKESET Origin 8 SPORT COMP V Front and Rear w Lever Black, Shimano Ultegra Brakeset 6500 Road Brakes Front and Rear Brake Calipers, Avid Elixir R Disc Brake Set Front Rear 185 160 Rotors, Magura Marta SL Disc Brake Set Front Rear 160mm, Sram Avid XX Front Disc Brake Set 160mm Gray Black New, FAST FREE US Ship Sram Avid XX World Cup Disc Brake Set Front and Rear 160mm, sram xx Front 160 hydraulic disc brake set new with mmx disc, Sram RIVAL Brake set new Brakes front and rear Black, 2011 Sram Force Brake set new Brakes light 280 g USA Front and Rear, Schwinn Caliper Brake Set Front Rear Type LS 24 Vintage Beautiful, FACTORY ORIGINAL DUAL CALIPER FRONT BRAKE SET for 1978 thru 1983 XLH XLCH WG, 2012 Magura MT8 Carbotecture Carbon Disc Brakes Front Rear Brake Set Rotors, Avid elixir 9 front and rear brake set white, AVID Elixer R Front Rear Hydraulic Mountain Bike Disc Brakeset White, SRAM XX HYDRAULIC BRAKESET FRONT REAR 160 160, SRAM XX Hydraulic Mountain Bike Brakeset FRONT REAR 160 160, SRAM AVID XX Hydraulic Mountain Bike Disc Brakeset Front Rear 160 140, AVID ELIXIR 5 HYDRAULIC DISC MOUNTAIN BIKE BRAKESET FRONT REAR 185 160, BIKE 225G Road Brake Set Front Rear Calipers BLUE, 1973 Honda Cb 450 Front Brake Set Up, VANGUARD MTB BMX Bike CNC V Brake Set Front AND Rear GREEN, 06 07 Ninja ZX 10R ZX10R ZX10 Front Brake Set, Ashima PCB Pan Cake Brake Hydraulic Disc Brakeset Front Rear 160mm Rotors, 06 07 R 6 R6 Front Brake Set, Sram Avid Elixir X0 disc brake set front and rear 2011, Bicycle Front Rear Promax DSK715 Disc Brake Set 203mm Rotors 4 Sets BB5 Pads, YAMAHA TW200 TRAILWAY FRONT BRAKE SET 1987 1991, Bicycle 203mm RED ROTORS Front Rear Promax DSK 715 Disc Brake Set BB5 Pads, NEW FRONT REAR DISC BRAKE SET 160MM ROTORS BIKE BICYCLE 4 SETS AVID BB5 PADS, BIKE 225G Road Brake Set Front Rear Calipers Red, 225G New Road BIKE Brake Set Front Rear Calipers SILVER, BIKE 225G Road Brake Set Front Rear Calipers BLACK, SCOTT PEDERSEN SUNTOUR SE BIKE BRAKES BRAKESET CANTILEVER FRONT OR REAR, FSA SL K CX Front and Rear Cantilever Brake Set Black with Red decal, New 27 Road Bike Caliper Brake Set Front Rear, FSA SL K CX Front and Rear Cantilever Brake Set Black with White decal, SRAM Apex brakeset brake set road bike Front Rear 2010, SRAM Apex brakeset brake set NEW road bike Front Rear, FSA K Force Front Rear Road Brake Caliper Brakeset Brake Pads Used, Hydraulic Brake set for Go Karts 250cc SUNL KMD ROKETA 4 point 2 front 2 rear, BIKE 225G Road Brake Set Front Rear Calipers BLUE c, BLACK LEFT SPRINGER FRONT BRAKE SET FOR HARLEY CHOPPERS, BIKE 225G Road Brake Set Front Rear Calipers Red c, Avid Shorty 4 Cantilever Brake Brakeset Front and Rear Cyclocross Black Pair,
