I feel like I'm always searching for a better tire, because I've never purchased a set of tires that I was totally happy with.
The best tire was the Michelin Pilot Sport's installed on the WRX, they where very expensive ($180 a tire), but always had grip and could be pushed much further before vs the RE92's.
The Pilot Sport A/S's have been discontinued, and are replaced in the lineup with the Pilot Sport AS3, which are closer to my target price, but still a on the high side. Also, being new in my eyes are unproven.
My personal tire history since 2004
Bridgestone Potenza RE92 - stock WRX
Michelin Pilot Sport A/S - WRX - Amazing, expensive.
Goodyear Eagle RS-A - stock Vibe
Yokohama ADVAN S.4 - Vibe - better grip in the wet then the RS-A, but not good enough to buy another set
Continental ExtremeContact DWS - Vibe - better overall grip, but very squishy sidewall
Bridgestone Potenza RE970AS Pole Position - Vibe - installed today
If the reviews are anything to go by the RE970AS's installed today should have as much grip as the DSW's they replace, but the sidewall properties of the ADVAN S.4's. Here's hoping

Hopefully, next summer I'll be able to afford some race wheels and tires for doing Autocross.