TVR or 1.8T 20v conversion.......
Out of the two I am going against the grain and would say TVR.
At least then your money/investment would only depreciate over the period of ownership you have it for. Whereas with an engine conversion, as soon as you have spent it, you'll never see any of that money back.
If you have alot of dispoable income, think about investing in your own abode. 5-10 years down the line when you decide you do want live on your own two feet, you'll regreat not getting on the ladder earlier. Bricks & mortar appreciate, 99% of cars depreciate. And i'd say your own flat is a much better pulling machine than a fast Polo or TVR

.