Well... firstly, welcome to the forum...
Secondly... I think Nels0n might have some tips on buying second hand... lol.
Thirdly, I changed my car 8 times in 5 years, and yet I have now settled on my Zed, it's as above - a 54 plate GT in sunset. All I can say is that it's bullet proof. I've really had no major issues at all in 2 and a half years of ownership now!! I still love the reaction it gets, and it's about the perfect sort of power really. I tend to feel sometimes that it's a little underpowered, but it is very usable. It has also got a brilliant chassis. The only thing you'd need to watch out for is the RWD, if you're not used to it. Catches FWD owners out sometimes!