Originally Posted by Roamer2

No offense meant, but you're kind of all over the place in terms of best usage for the bikes you are mentioning. Some are entry-level mountain bikes, some are comfort hybrids...others fitness-style X country hybrids.

I only mention this because they have vastly different riding positions & gear ratios (thus things they are good/comfortable at doing for sustained periods). If you are just pleasure riding w/ the wife at a moderate pace for a shortish period of time & are very concerned about rear wheel strength...that Roll Sport looks pretty good. With that geometry & big tires, it's going to be a relatively comfortable, plush ride. It's a bit of an oddball in that it has streetish gearing but MB sized wheels. You will be limited in "faster" tire choices somewhat.

Most important is how the actual bike fits you personally...and how easy/fun it is for you to ride. You're not going to ride a bike that hurts you after 15 minutes of doing so. Be sure to take each candidate on at least a 15 minute ride before purchase. You can always bargain the LBS to build a strong rear wheel for one of the enrty-level bikes that fits you well and still stay under budget.

For your use, you really don't need discs. Some people prefer them (myself included) but they only really shine in wet, sloppy, fast conditions (and maybe modulation/pressure required). You will probably be better served by spending that money on a saddle that is comfortable for you and a peddle upgrade from the sorry stockers that come on most of these bikes.

Best of Luck!