Replace MB

[bobbob10]

Looking to replace my old MB but keep as many of my existing PCI cards and other functions as possible and flexible upgrade possibilities.
Would like a MB with PCIe & AGP, IDE (Pata) & Sata, 2+ expansion PCI ports, on board Lan, Audio & Video capabilities.
I have found only one Chipset that has all the above, SIS 761GX/96SL and one MB that uses that chipset, PC Chips A31G.
Any problems/cons for that MB?
Any other chipset/MB that has the above capabilities?
I want to keep the cost down so I don't need multiple processors or expensive Ram memory.

I must also get a larger power supply, is a minimum of 450 watts large enough to allow expansions of Procesor, HD, Audio and Video?
Do I need special connectors like for PCIe peripherals?

Thanks