Why don't you like the factory pump setup? It's a pretty good system and should last a long time if properly maintained. A shot of MMO in each tankful of gas will keep the whole fuel system clean and lubed up which does extend the life of the pump and the rest of the system. If you seriously want an inline pump, I highly recommend Aeromotive fuel pumps. They are a bit pricey, but they are far superior to the factory pump and will last longer. You could still use the factory tank, or upgrade to a fuel cell.
2005 ZR2 Blazer / Mods- Spectre CAI, Descreened MAF, Shaved Throttle Blade, 31" Goodyear Kevlar MT/R's, Black Rock Rims, MSD Street Fire CDI & Super Conductor Wires, Accel Cap, Rotor & Coil, Flowmaster 30 Series, Gibson Tailpipe, ES Bushings, Goodridge Brake Lines, Power Slot Rotors - 1996 Impala SS / Mods- Too Many To List - 1988 S10 Blazer / Mods- Too Many To List - 2001 S10 Crew Cab 4x4 / Mods- Too Many To List *Wrecked 12/06*