I have a 1991 AT mini-tower that originally had a 386 board in it. Over the years I've upgraded to a 486 and 3 years ago to a Socket 7 board with a Cyrix 233 MMX. I'd like to upgrade to a board that will still fit the case. What is the best option for a board and chip for this case at this time? I use the computer for children's games, basic computing, and some digital work and I want to keep the costs down as much as possible. I have a 64 MB DIMM memory chip. I'm happy with the video card and sound card that I have now. Thanks.