Engine/Transmission (1998.5 - 2002) Next mod? Twin questions.

[BenSeymour]

Hey guys, just got my new Con FE, and am going to install it next weekend. Have been building the truck the right way, getting all the stuff in place to handle the extra horsepower from more mods. My ultimate goal is slightly above 500 rwhp. I rarely tow anything over 4K (dirt bike trailer). As my sig below says, basically all I am missing now is a bigger charger and some injectors. What do you guys think is the best way to go. Originally I was going to go with the HX40 and some DD3's or 4's (or something comparable), but there are so many opinions on here, I just wanted to see if there were any other ways to go. I would love twins, but it just isn't in the cards right now from a financial standpoint. Plus I still don't have all the plumbing figured out. I understand the concept of a little one pushing a big one, but does anyone know a good thread or site that outlines the plumbing of a set of twins (for future use in building a set)? As well, what's everyone's feelings on wastegated vs. non-wastegated turbos for the HX40? Anyways, I know that's a lot of questions, but if anyone has any input on any of this, I would appreciate it. Thanks-