Caught between old and new What MB would work for me?

I built a "new" system last year in Nov. It is the Intel D865GVHZ mb, with P4 3.2Gz, 2G Crucial PC3200, I have a 20G Western Digital HDD and a WD 320G HDD, a Sony DVD burner and Creative 52X CD-ROM, Nvidia GeForce 9400GT, and Turtle Beach Riviera sound card.
This has been the worst pc I have ever owned, that I built, it seems to be at about the same speed of the AMD Athlon 2.1G I had before and it had 1.5G of PC3200, with the same HDD and everything else. The CPU always tries to run on the hot side, and freaked on me the other day, benchmarking my RAM with SiSoft Sandra, it started beeping and then the next morning wouldn't boot at first and then said it had a memory timing error. I run Windows XP Home on the 20G HDD and use the 320 HDD for storage and installing all other software, games etc... they are both IDE, the video card and sound card are both PCI.
I am considering building a new system with the AMD Phenom II x4, but I am not sure how to fit in my other older stuff, mostly my HDD's, since most I see only has SATA 3 and 6 and at the most 1, possibly 2 PCI slots. I know I can ditch the 52X CD-ROM, can't the DVD burner. I considered the option of built in 1394 port and connect my HDD's to it, until I can afford some SATA's, or possibly external enclosure, but not sure how a system drive would work on that, and I have 2 drives also. I also have a PCI video card with 512MB DDR2, DMI, HD, that is less than a year old, that I hate to put into retirement. I also lean toward Gigabyte Mb's, as I really liked my last and the BIOS and overclocking functions.

Any suggestions?