For street cars I prefer and sell more Sports than anything. Ultralites are stiffer, despite what you might have read on the internet. There are some funky things with some springs in terms of rates. Some are lower, and not actually stiffer than stock springs (the Steeda's are not like this), which essentially makes the bumpstops the defacto springs, and that's not what you want.
I'd be happy to talk to you about spring options, we have a few. I do prefer the Steeda, but sell others as well.
Strano Performance Parts
7x SCCA Solo National Champion