Flexwatt will provide plenty of heat to keep the tank at optimal temp. And, yes, definately, at least get a dimmer for it. Helix's are great thermostat's but I have a Johnson's Controls that I got for $65 that works great, too.

If you want a pre-wired thermostat or dimmer, plus pre-wired flexwatt, check out Matt's site: mgreptiles.com