PCI-Express is the new graphics card slot/interface & runs at x16 speed opposed to AGP's x8 maximum. Having also used AMD cpu's for ages now I can't see me going to Intel but you never know?, I've no immediate plans to go the Intel route though.
I currently own two AMD processor motherboards, one is a fairly inexpensive board made by WinFast/LeadTek, who have become one. I think WinFast & LeadTek worked together on various projects previously until WinFast bought over LeadTek?.
This motherboard is a 6100-K8MA
with PCI-E, it has an nForce 410 MCP chipset so works well with NVidia graphics cards, I've got a 256MbDDR2 6600 card in there atm but there's an NVIDIA GeForce 6100 onboard GPU if you need it. I won't go into detail as you can check for yourself by following the link to it's sec page.
Another Sckt-754 board which supports x8 AGP
is the Gigabyte GA-K8NS Pro
, it supports AMD cpu's from Sempron 2600+ (Paris and Palermo) through to the Athlon 64 3700+ (Venice, SledgeHammer, Newcastle).
Both motherboards have onboard 7.1 or 8.1 sound, DDR400, FireWire, onboard LAN etc,.
It might be worth considering the PCI-Express graphics interface though as the word on the vine is that AGP is being phased out gradually, I can't comment on this myself? but Im presuming AGP will be around for a while yet as there are still new AGP cards being shipped?.
All I know is that Doom 3 looks amazing running at 1024 x 768 and above with 32-bit colour with my PCI-E card compared to my 128Mb GeForce4-4400 (x8 AGP) & I'm achieving consistent frame rates in the multiple hundreds range with Quake 3.
Sorry for my long reply but I've a habit of prattling on