I recently had a similar choice to make for my 2002 and, while I considered StopTech, I choose Sean Roe's 14" front upgrade.
I wasn't sure if I needed a 4 wheel brake upgrade or just the fronts. The Roe kit simply relocates the stock caliper, so the cost is mostly just hats and rotors. Obviously, this makes the switch less than the StopTech front system which includes new calipers. Going ths route also leaves the door open to upgrading to the StopTech calipers in the future with little price penalty. Finally, If I ever want to make the jump to the StopTech 4 wheel system, the only "extra" parts I have are the caliper relocation brackets. When you upgrade from the StopTech front only kit, you have to purchase a another set of front calipers.