I wanna get new parts for my bike and im not sure which brand i should pick. Im not talking about a $1000-$2000 Specialized or Trek bike, its just a $300-$400 entry level, Dual suspension steel frame (I just love steel frames) My bike comes with SRAM MRX shifter and a Shimano Tourney Derailleur. I replaced the old crank with a Shimano Crankset. I like SRAM and Shimano, but should I go all one way or have a mix with shimano derailleurs and SRAM MRX/TRX Shifters. I dont use this bike for racing or touring, i just bike with my friends around the city, and im only a 15, so i dont need any XTRs or X0s. can you suggest anything good for a "bang for the buck" bike?