What are you wearing now? 2pc leathers? Surely youre not wearing textiles on a track, right?
I have a 2pc Dainese suit that is cowhide... I got it off ebay for $900 from a company in Germany, US price from Revzilla was $1400. If you can try a suit on and know your size, you might want to save some cash and buy off eBay.
Also, if you can find a suit made of Kangaroo leather, in a slide it is reported that Kangaroo leather is more durable than cowhide, some Dainese suits offer Kangaroo leather. Also, its been my experience that the Kangaroo leather suits often have Kevlar stitching. Why is that important? Over the life of a suit, sweat/salts can break down the regular stitching, whereas Kevlar stitching is less prone to breakdown, thus extending the life of your suit.
Just something else to consider is all.