It's one of those how much do you want to spend things realy?

For starters, for what you want, there is no need to go front mount at all.

I'm sure someone will either back me up on the next one or give different numbers, but a full de-cat from what I can understand will give you about 40bhp. (That's my next mod)

The things I would recommend would be: Turbo / Injectors (I presume you are on 550's?) / De-cat / re-map. You could then if you were feeling flush, also add things like forged pistons (not rods unless you REALLY need to) bearings?

Then there is Coilovers and brakes to add into the mix potentially.

I'm sure someone could give you some costs, speak to CJ & Dyney first though, as I have found out since buying my bits that they might be able to help pricewise with their contacts.

Good luck with it mate, it is a minefield out there!