Get some Bridgestone BT003RS. Brilliant tyre when you're starting out on track. Very good grip, last ages until you get super quick. And cheap at $400 a set. I ran these until halfway through my first year of club racing. No point in chewing up race tyres until you need them :P

http://www.ebay.com.au/itm/BRIDGESTO...dE3Q8VQKhFJrkA