Any time you start modding an l99 and are considering cam and/or fi, it'd be a good idea to toss the afm lifters in favor of ls3's. AFM lifters don't hold up all that great in stock vehicles.
It really just depends on your goals, do you want a hp number, do you want a track number, do you want to race the car or just mainly daily drive the car. There are tons of great options and everyones opinion will vary. But in the end, you need to decide what your goals are, and then mod accordingly.