if changing the engine its pointless staying mfi, but if your on a buget my mate mikey could sort you out chipped ecu, nice head with kent cvh37 camkit, boost hoses ect and help you build up a engine and fit it

then you will just need a set up and intercooler... it wouldnt cost too much that way, but to be honest if you have a standard car i would just do the following

bailey breather system
chipped ecu
new -31 actuator
front mount intercooler
full service
mikes cam and head

and you should be 185/190bhp which will fly compaired to a standard car...

im in easthampstead next too the sports centre if you want to pop round one day next week