Without an SLI setup on that board all that is available is the 8 lines and not any further towards the 16x capability of even a single 1.1 model card. Now compare that to what would be lost with a brand new high end 2.0 card to see how that analogy hits the mark especially for planning out a gaming build.
Are you going to rush out and spend $300+ on a new high end 2.0 card while a single $125 1.1 card can't even benefit from the lack of performance on a specific board? The best move with intent on the latest card is to go with a board that actually offers support for the new line as well as seeing all 16 lines available when using a single card by itself since there is no plans on SLI.
Unfortunately that vendor only offers a limited selection of boards to begin with. The Asus M3A however is a PCI-E 2.0 board while seeing an AMD not nForce chipset as seen at
http://www.cobra-computers.co.uk/scr..._id=65&id=1172
The memory standard is 1066/800/667/533 over the MSI model's 800/667/533 as another plus to add along with the one main item of concern namely support for the 9800 GTX. I can imagine the price factor of 89.99 over 49 pounds is the main drawback however. That's where shopping around to look at what other vendors have for specials could be a help.