These are able to handle Gigabit ethernet, and the faster speeds should make their future usefulness better than Cat 5e.
Class E Cabling
Cat 6 is no longer that much more expensive than Cat5e, but offers better performance and is capable of handling faster speeds. Cat 6 cable costs about $0.40 to $0.60 per linear foot.
Costs vary greatly by region (and even by zip code). To get free estimates from local contractors, please indicate yours.