Quite honestly I prefer metal tweeters to textile or silk or what have you. I have some wonderfully smooth silk Vifa tweeters that cost more than some speakers I've owned. But as a drummer, I've always found metal tweeters are the absolute best at reproducing symbals, snares etc. Not to mention squelch in a searing Joe Satrianni solo or whatever. To each their own I guess, don't rule out metal tweeters though, nothing wrong with them at all.

I'm not a fan of the Infinity Betas, and would gladly take the Monitors or Connoisseurs in a heartbeat. I agree with RGA, the last 2 brands can easily be found used for a good price.

My advice to you is to buy a smaller model than the large floorstanders. I find the Mini Monitors or C-3's for example to sound better than their larger counterparts, without sloppy cabinet resonance.
The money you save could be put towards a decent subwoofer and provide more satisfaction overall.

Good luck.