[Xeen]

You don't have to spend $5,000 to get a comfortable ride, the porterbuilt stuff is more for the guys who want to go lower than what is possible with most aftermarket parts.
Even though porterbuilt does make a "stage one" lowering kit IMO it isn't worth the money you will spend on it because CPP makes everything you will need for less money and the quality is good, some guys may disagree but that's my opinion and I stand behind it.

Now if you wan't to lay frame with air ride then there is no better set up than porterbuilt it is the best hands down and they will make sure you have the right parts to suit your needs.
If you have an unlimited budget and just don't care what it costs then go porterbuilt for everything regardless of what stage drop you are going with.

LSX is definitely the way to go for power and reliability, there is no better choice.
I recommend a LS3 for bang for your buck.
Another option is the LSX 376-B15 with twin turbos for the ultimate experience.
Another option is the LS9 for plug and play thrills.