Help choosing LS engine

[scherp69]

So I was thinking about getting a Mast Motorsports LSX454 but I started thinking about it more and I really want the car done some time in the next few years. Although it looks like a sweet motor and I would love to have it, it would run me $16500 without pulleys and accessories. I can buy alot for that kind of money. I was looking at the new GM Performance catalog and see they have a new LS3 that puts out 480hp and it's just under $6500. I was searching for aftermarket stuff for the engine as I really want to be over the 500hp mark. I couldn't find much for it. This brings me to my question....of the LS crate engines, which ones have the most aftermarket power addons? I see alot for the LS1, LS2 and LS6. When I do get the engine, I want one with the the LS1 style intake. My goal is to get a crate engine around 5 or 6k and get some addons to put me over the 500hp mark. Unfortunately I don't have the funds right now, so I'm trying to plan ahead. I know nothing about LS engines so any information would greatly help and be appreciated. Thanks in advance.