Imo 97-03 gp's are the best looking generation. There is alot more available for them too. I prefer the look of my interior compared to the newer gen gp's. Only thing i like off the newer gen gp's are the comp g seats and wheels. I will have to do the upgrade later on.
there is ALOT more interior room as well
'04 Chevy Silverado LT 4x4 - intake, headers, full exhaust, zo6 cam, 799 heads, tune, leveled, 33's '00 Grand Prix GTP DAYTONA 500 - L36 block, S1X, intercooled, GenV, N*, headers, full exhaust, coilovers, 5 speed swap, stage 3+ clutch