Stage one,
Turbo back exhaust,
FMIC
Boost controller(0.85-0.9)
1 stage colder plugs,
uprated fuel pump,


Even with the standard ecu you should be seeing approaching 250hp from the above on a healthy engine safely for road use.

Anything beyond that(turbo, injectors etc) will require a mappable ecu.


Have a look here for the sort of money the above parts can be had for...
http://www.inoc.ie/forum/showthread.php?t=1040