The 7.3 looks to be the better choice in terms of componentry. My own personal preferences for gear/accessories can all be had from http://www.bikeisland.com w/no shipping charges. Not a shill for this site. The equipment and service are top-notch. Fenders, lights(for darkness riding at least 10w halogen for the front), multi-tool(bikeisland has a Park MTB-3 which has a built-in chaintool), tube(s), tire cleat, tire levers, patch-kit, rack, panniers or trunk bag, frame pump(Topeak Road Morph w/gauge) and a wb cage. If you're going to ride in darkness reflective tape and clothing are requisites as well as blinking taillights.

Looking at my commuter/utility bike as I type this my rig has all the aforementioned accessories and doesn't look overloaded or busy. In addition to a night light I run a blinking daylight 'be seen' light as well. Side reflectors in my spokes along w/reflective sidewall tires.

My commute's pretty long so it's necessary for me to equip my commuter as if I'm doing a light tour everyday. Your needs may not be that extensive, but getting good quality gear is a good habit to develop. Over the last 5 years of cycle-commuting I've had 2 full-stop road emergencies. Both were flats. No mechanicals. The better part of stress free commuting is consistant maintenance. Haunt the Mechanics sub-forum. Ask questions. They're the best and are very generous w/their knowledge. "Better to know and not need than to need and not know." B.B. King

So, do your homework. Have fun!