I have seen many, many people recommended Holley EFI in all their variants. I was recommending using the stock computer to keep him within the budget, as it is very capable given it's cost (~$200 for a stand alone).
If you plan on upping the budget, maybe give us your best estimate and we can re-do our suggestions. If you up the budget a couple grand, you still would need to decide where it goes. Different EFI, dual turbos instead of single, etc etc.
It's very easy to snowball. I often wonder if I should have just stuck with my original plan of throwing an ebay turbo on my stock 6.0 instead of tearing it apart and building the motor for higher levels of boost. I could be driving my project pickup now, instead of piecing a motor together as money comes in. I know that when I'm done, I'll have a (relatively) bulletproof engine, quality parts, and more piece of mind. However, it may be a couple years before I have it done and even quality parts can fail unexpectedly. If I buy a high quality fuel pump and it happens to get a little weak, that could make my engine run lean under load and smoke my "bulletproof" engine if I don't catch it. Seems to be some people can run junk for years and never have a problem, then I do it by the book and have a random failure ruin it.
Just some random thoughts to consider. Even the best laid plans can go awry. Be away of the law of diminishing return, a $5 bike is better than no bike, a $500 bike is quite a bit better than a $5 bike, but a $5000 bike is probably not a huge difference from a $500 bike.
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