Thanks so much for all the info. I just checked back in after running the different brands and speeds of ram for 3 months and they work great together as far as I can tell.
According to Lavalys Everest the installed memory modules are:
DIMM1: Hyundai HYMD264 646B8J-J 512 MB PC2700 DDR SDRAM (2.5-3-3-7 @ 166 MHz) (2.0-3-3-6 @ 133 MHz)
Field Value
DIMM2 GB Micro DDR 512 MB PC3200 DDR SDRAM (3.0-3-3-8 @ 200 MHz) (2.5-3-3-7 @ 166 MHz) (2.0-2-2-6 @ 133 MHz)
I went to crucial.com at Kain's suggestion and it for some reason doesn't distinguish between the 2 sticks and just recommends an upgrade to 2G instead of the 1G that is there.
Thanks again for all your help you guys are great!!