Sport seats have larger bolsters, comfort seats have articulating backrest. Easily distinguished - the comfort seats 'shoulders' and headrests are squared off while the sport seats are rounded. Sport seats also have an extendable thigh support.

Sliding load floor is basically a big tray that slides in and out so you don't have to reach IN the trunk to get things. Only useful if you are under 5' tall IMO!

Aux port is about $40 and easily retrofitted.
http://cgi.ebay.com/ebaymotors/Parts...ht_1758wt_1502