I think that digitally optimized lenses can be made to suit the smaller sensor size so therefore can be made smaller and cheaper there should be little difference in quality.. However if you get a full frame camera at another date you will not be able to use them at the wide angle as you will get some vignetting

Danny O'Byrne  http://www.digitalartzone.co.uk/

"All the technique in the world doesn't compensate for the inability to notice" Eliott Erwitt