If you're looking for a pure driving experience on a budget the E36 M3 fits the bill for your track-day needs
BMW F80 M3 Project Car
A pure classic E36 BMW M3 GT limited edition only came in British
1996 BMW E36 M3 Estoril Blue
Modified 1996 BMW M3 Coupe 5-Speed for sale on BaT Auctions - sold
1994 BMW M3 review - Drive
BMW M3 30 Years American Edition - JCD - JDM Export Import Pros
This E36 BMW M3 Fits Like A Glove - Speedhunters
This E36 BMW M3 Coupe Is A Great Track Toy 25 Years Later
Your handy 1986–91 BMW M3 (E30) buyer's guide - Hagerty Media