The only reason that I would think twice about getting a Socket A system is the fact that all the chipsets are made by VIA. That is an irrational hatred, by the way - I've just never liked them!
I built a PC for my girlfriend, and used an A-bit KT7A mobo - and had quite a few problems. Mainly with PCI cards, but it was annoying. There was a really helpful site, www.viahardware.com, which was SO useful - but it isn't around anymore. But I know that AMD used to make chipsets, and I just wish that a comany other than VIA would.
Anyway, as I said that is a bit irrational...
But I definitely agree that Pentium's are for people that are prepared to spend a lot. I am using a Celeron (yes, I know...) 1.0Ghz, and despite the fact that the Pentium III platform is quite old (by today's standards) it still costs obscene amounts to buy proper Pentium III's - so I'm not going to upgrade my CPU until I get a whole new mobo - which I have no other need to, as I have an A-bit BX-133 RAID - and I love it!
If I could get whatever I wanted (money no object!) I think that it would have to be a Pentium 4, with the Intel 845e chipset.
But if a company other than VIA made chipsets for AMD's, I would go there instead :)