I am in the exact same boat as you, I just need to do abit more saving...
Cars I have been looking at:
Honda Integra DC2 basically a road track car from what I have heard
Honda Integra DC5 same but newer, slightly less raw than the DC2 from what I have read.
RX7 - This is my wildcard, someone I know has one of these and its not that highly modded. He has said to me that a sorted RX7 is unstoppable on the track in the right hands. Thing that scares me is the fact its a rotary engine and reliability is not there strong point. I have heard that they are fairly reliable if you know what your doing.
Just my 2p