Hi mate,
Ignore all these haters, they are just jealous. There are quite a few things you can do to liven up your hot hatch. Firstly I'd consider something like a Catback exhuast system from somewhere like Powerflow. This will make it sound pretty good and also free up at least 7bhp. Pair it with a K&N air filter for an extra 5bhp, and a remap, and you are up to 85bhp already. You can also get power resistors from Ebay which alter the fuelling and are good for another 10bhp, so now we are at 95bhp which in a car as light and agile as the Corsa is really pretty damn good.
You'll want to uprate the wheels and suspension to handle the new power, though, so I'd pick up a full adjustable coilover kit from Ebay, cost you about 200 quid tops. Also you'll need some bigger wheels so you can fit bigger tyres. You can get a 17" wheel and tyre package with some quality tyres such as Triangle Performance or some Ceat Tornados (CEAT are awesome, they are really just rebadged Pirellli's) for about 300 quid.
Somebody else on this forum has done a similar thing and he acheived great results, here is his car:
http://forums.overclockers.co.uk/showpost.php?p=16635891&postcount=6601
Good luck and dont let the jealous haters hiding behind PC screens put you off.
Not everyone can afford a Ferrari or an Audi A4 2.0 TDI S-Line.