Definitely still OK to get KT133A, the SDRAM prices sort of fall along with the DDR prices. Crucial PC133s only cost about $60 for 256MB. Plus you can reuse your SDRAM with KT133A. KT133A boards are more matured right now because of BIOS revisions, and overall, I think most KT133A boards have better layouts than those DDR boards, and the best thing is, you aren't really losing any real world performance to DDR.
The MSI KT133A board is a very polished one, not the absolute best, but it's a very cheap, and ultra stable motherboard.