Last year I bought a used (2009 or 2010 I think?) Haro Shift R3. Coming from a hard tail and only riding on Long Island (packed/sandy intermediate singletrack) terrain, I'm super happy and don't feel like I need any upgrades yet. I would like to get some opinions as to what should be upgraded first when the time comes, though.
Bike is stock, aside from the rear shock which is a rockshox monarch 4.2, and some wellgo flat pedals. Specs from the '09 model according to bikepedia:
Fork Brand & Model Marzocchi 22 LO, 120mm travel
Fork Material Single
Rear Shock RockShox Bar 2.1, 120mm travel
Components
Component Group SRAM X.5/mix
Brakeset Hayes MX4 w/160mm rotor brakes, Tektro alloy levers
Shift Levers SRAM X.5 Trigger
Front Derailleur Shimano Deore
Rear Derailleur SRAM X.7
Crankset TruVativ ISOFlow 3.0, 22/32/44 teeth
Pedals Alloy platform w/steel outer cage
Bottom Bracket TruVativ Power Spline
BB Shell Width Unspecified
Rear Cogs 9-speed, 11 - 32 teeth
Chain Shimano HG53-9
Seatpost Alloy Micro Adjust, 30.9mm diameter
Saddle WTB Rocket V Comp
Handlebar Ritchey Riser
Handlebar Extensions Not included
Handlebar Stem Pivit Alloy
Headset 1 1/8" Ritchey Comp Logic
Wheels
Hubs Front: Pivit Disc, Rear: Shimano M475 disc
Rims Ritchey Girder XC, 32-hole
Tires 26 x 2.10" Kenda Komodo
Spoke Brand Stainless, 14ga. (2.0mm)
Spoke Nipples Unspecified