I've "heard" others say that Abit has a high error rate. However, I personally have used many Abit boards, and I have not had one single bad one. I'm talking close to a dozen machines that I either built, or speced out and helped friends build. All Abit, none bad. As far as overclockability and tweaks, nothing beats Abit boards. The only two brands of mainboards I will consider are Abit and Asus. Even then, I read reviews and make sure the particular model I want is a good one before I buy or recommend a board. I'm still running a dual-celeron Win2k server on an Abit BP-6, and my current classic Slot-A Athlon runs on an Abit KA-7-100.
Ok, well there are only two things I would recommend right now. 1. Get a DDR RAM system. It's just as cheap as PC133. 2. DO NOT get a RAID board unless you really plan to use the RAID features.
You don't want to go with the RAID boards unless you have the proper drives to use it right. Otherwise it's just more money and sucks up more IRQ's and such on your mobo.
Check this out:
http://www.hardocp.com/reviews/mainboards/abit/kg7/ I don't think this one is quite ready yet... give it some time. However, it's just showing that the DDR platform has some nice advantages. The Iwill K266 board has been very well received, although I have never used one of their boards. If you are waiting a couple months, you'll see lots more DDR boards out this summer and that market should stabilize. nVidia should be rolling out their mainboard chipset in the next few months too, and it has the potential to bring higher performance.
If you don't want to go DDR for some reason, you can't beat the Abit KT7E. Sweet, sweet little blue board. No frills, it's low priced, and quality. It will OC well too.
http://www.hardocp.com/reviews/mainboards/abit/kt7e/ I've recommended that board to a few folks now, and helped build machines. It is a sweet board, OC's well, no big IRQ problems, and it's got 6 PCI slots. Did I mention it's very competitively priced? In Canada it's about $100 cheaper than a the other good quality Socket A boards.