Well, this is tricky.
Every car on my shortlist has its pro's and cons.
MK 2 Cupra -
Pro's - Good amount of power, smart looking exterior, fairly well spec'd, same chassis as Golf GTI
Con's - Not many for sale, interior is a bit rubbish
MK5 Golf GTI -
Pro's - Best in terms of depreciation, very well reviewed/regarded car, good build quality, fairly well spec'd, loads for sale.
con's - very common, not as fast as the Focus ST, bit drab to look at, would have to settle for an older/higher mileage on for the budget.
Mazda 3 MPS -
pro's - lovely amount of power, decent looking interior, very well spec'd as standard, could probably pick one up for peanuts as they are very hard to shift
con's - They are very hard to shift!

p), stupid tax band, mixed reports on fuel economy (some say it drinks petrol, some say it will deliver 35mpg on a run)
Skoda Octavia VRS -
Pro's - Cheap to buy, same chassis and engine as Golf GTI
con's - Not that well spec'd as standard and really well spec'd ones are rare, not as fast as the Focus ST, I only like them in blue ( maybe red)
BMW 130i
Pro's - Sort of always wanted a BMW, good performance and a great engine, even though I think it isnt regarded to be as well made as other BMW's it will probably be of better build quality than the others, fairly well spec'd, no turbo to worry about going wrong
Con's -possibly more expensive if other bits go wrong!, not sure if actually in budget( Only two in budget for sale at the mo are from small garages in london and they come in at £1-2k under all the others).
I don't know what to do

. I'm probably over thinking all of this.