96chevy

I have a 1996 silverado with a 5.7 liter. I want a little more power and have to take the top end off soon to replace intake gaskets so i decided to go with a new cam because they are affordable. i already have dual exhaust and am looking for a set of headers as well. I am looking for some suggestions for what cam to go with or what to look for. I do not want to modify the heads, i do not want to replace the rockers or springs or whatever. I just want to replace the cam for a little more juice. Any suggestions. This is a daily driver and i do not want to screw with my fuel injections. Any suggestions would be greatly appreciated. Considering the following:
http://www.summitracing.com/parts/CCA-12-407-8/
http://www.summitracing.com/parts/CCA-08-525-8/
http://www.summitracing.com/parts/HRS-180225/
http://www.summitracing.com/parts/CCA-08-407-8/

if i have to replace springs or rockers with any combination you suggest please place a link so i can see prices or whatever also. Thanks