For the pay increase, much better commute and actually having something to do, which will generally make you feel better, I'd say go for it.
However, I am a little concerned that you wouldn't take it for the same pay. Says to me that you aren't that upset with your current situation or you are fairly cautious with changing jobs (tho you said you've hopped around some).
As suggested by others, I'd ask for 4 weeks vaca to match current.
Also, I usually figure I can do anything for 2-3 years. Dig around to learn more about the working environment. Would you be replacing someone who left? If so, why did they leave? Unless you have your radar warning going up, I'd go for it.
Presumably, if you were applying to both of these jobs now, you take the new job (higher pay, lower commute).