Do you already have the engine, and everything you need for the swap? If so, you could build one hell of a nice setup with $2500.
- Custom exhaust manifold (Stinger, Rod, or 40Bob) ~$300-$500
- Bigger turbo (T03/T04 50 trim i'm told is the best matched combo for the 2.3 for up to 400hp) ~$not sure
- Lots of work on the cylinder head (ported, big valves, remove the shrouds over the valves) ~ $not sure
- Custom, or better, cam ~ $300+
- Bigger throttle body (65mm Ford Racing, anyone?) ~ $150
- Full 3" exhaust (turbo outlet back) ~ $300
- Big VAM and an LA2/LA3 computer ~$ less than 100
- 35lb/hr fuel injectors ~$50
And that's just engine mods.