I think you could probably do ok for £3k, but it all depends on how much labour you have to pay, whether you buy bits new, do it yourself or what.
I did go in Matt's car though and it went like stink

Don't get me wrong, i was by no means suggesting he did something wrong or wasted his cash, i was simply interested in WHAT was done!
as for going like stink - I totally get that, a highly tuned N/A is responsive as hell!