http://www.lceperformance.com/LCE-Pro-Fuel-Injection-Kit-2-4-Cylinder-p/1063024.htm
It is time to put the wallet down and step away when you start wanting/needing a stand-a-lone EFI system for your 22re.
In my experience there seems to be basically 5 “power levels” for the 22s.
2 – you add a header and 2.25” exhaust pipe with free flow muffler. – estimated increase in Tq and HP 8 to 10%
3 – you swap heads with oversize valves with a bigger or torquey cam to go with your head and exhaust, intake manifold and Weber. – estimated increase 7 to 10%
After these two mod's, the 22r series just doesn't have that much reliable hp left to find, and milking out what is left tends to make cost more than it is worth.
How crazy you get I suppose is how badly you want to keep the Toyota badge and how much time and money you have to throw at the modifications.
If I were doing a swap to satisfy my desire and had extra money in my “swap-it-bank”, I’d install a V-8.
Gnarls. 
You can keep the Toyota badge and have more ponies than you need w/o going to a V8, Toyota has 2 I6's that will will produce anywhere from 220-1k HP. On a budget build a 7mgte swap is good for 220-500hp, and can have 400hp for under $5k, while the 2jzgte will produce 400-1k hp for $5k-?
