The DFI NF3-250 Gb boards aren't too expensive here in the US, around $100 delivered from Newegg or Chiefvalue and are great boards and even have all the bells and whistles for that price. For a cheaper solution I don't know though. I don't know about the Sis chipset boards but I do remember reading that the pci/agp lock works on that chipset. With the Via chipset, I think that it's a crapshoot whether the pci/agp lock works.
For value memory, you can buy the
OCZ Value 3200 with Winbond chips for around $115-120 delivered in the US from the egg or Atacom. This is a 1 gig DC kit, which will work fine for building 2 folding rigs. You can also use the TwinMoss PC3200 Speed Premiums (SP) for around $50 (512 MB sticks)from the Egg, witch have Winbond UTT chips on them. Both of these series of ddr will run tight timings, but need high volts to do it. The DFI board can run around 3.1-3.2 v vdimm and higher with modded bioses and psu's. I have 1 DFI board that is running a mobile clawhammer at 2700 MHZ with 3.2v, ram speed at 243 MHz and 2-2-2-10-1t timings with an unmodded TT purepower 420 psu. but you can tell the psu is loaded pretty hard.
As far as for pricing in the great white north where you live, I have no idea though. You will have to ask some of your fellow polar bears about that.
BTW, I recommending the 512 MB sticks of ram so your folding rigs can do BP work with no problems.
.
I've been trying out each stick separately so I could find the weak spot easier and so far, both sticks memtest fine up to 235 MHz and 2-2-2-10 timings with 3.1v vdimm on my new Lanpraty NF3-250Gb system I'm putting together. They both started showing errors in memtest around 238 MHz with the above timings. I'm presently testing at 238 MHz and 2-3-2-10 timings with 1 pass made and no errors. 
Similar Threads
