i don't think you will notice the difference in swing arms! its more cosmetic then anything as far as road riding is concerned.
if 03 999R's are available for around 11k then i would jump at that! (i thought i was getting a good deal paying 17k for a new 03 999r! early last year, doh!
excellent value for money! (you will need to get a proper termi back box if it doesnt have one fitted) If the cost aint an issue tho, go for an 04!
[Edited on 9-6-2005 by chillo]