if its hust a file server then the 244 is plenty..maybe overkill. And I take it you got a single 244 because your using a dual board?, and plan to upgtrade later?. Other wise the 244(dual) is a waste get a 1xx series.
If its purely a file server I would perhaps go a cheaper CPU and grab larger HDD's. 512m should be plenty but if you have a LOT of users 1G might help with disk cacheing.