You really need to be a LOT more specific. You can't just say Radeon 9800, or even worse just GeForce. The name GeForce has been given to a line of cards spanning ~5 years, so giving me a price and saying GeForce doesn't mean anything.
The price on the 9800 is also useless unless it has an extension (SE, Pro, XT). From that price I guess it is an SE, which is a BAD price (roughly £115 new anywhere else). It could be a plain one with no extension, but you need to specify. The PC-World site gives me 2 hits, neight for that price.
VGA switches can range from £10 to £200, the price depends on the output quality and the features. Pay more if you want better quality.
I have no idea on A1 or Peg compatability as I don't care about either.