for that kind of power your looking at a g60 or vr6, but both engine will be a bit long in the tooth and may require a bit off attention. also the vr will be very heavy. if it was me i'd go for a 20vt conversion which come in all sorts of power levels from 150bhp up to 225 then you've got alot of tuning potential on top of that. your looking at around £4-5k for a conversion.