^^^ the reason i suggest nvidia is because it has much better support in linux (something which may be of no concern
) and also because nvidia generally has better 3d performance than ati video cards (this is a gross generalization) but i have always wanted an ati all-in-wonder. i guess its mostly personal preference.
i didnt actually look up the unit you were looking at, so im not sure what that mobo can take, processor wise. the turion is a mobile processor and a decent one at that. if possible tho, i would suggest going with a slower (in clock speed) dual core processor than a single core processor with a faster clock. thus a turion x2.