I’ve never meet anyone with 60 lbs of variable weight; you should be just fine if you’re on the lower end of that weight range.
The 250 definitely have enough power for around town on the streets. I also hear the 2008+ models are much more capable of going on the freeway; however, I wouldn’t recommend one if you will be doing MOST of your driving on the freeway. At freeway speeds the RPMs will be much much higher and a lot of freeway use will lead to more wear and tear on the engine. Otherwise, the power will be just fine.
Expect to pay 5000-5500 out the door on a new 2008 ( or 2009) model- they are in very very high demand. Used ones may be a little easier to find, but command only a little under the new price.
There are also the Ninja 500 and 650– although the 650 looks and feels much closer to the 250 and is definitely more comfortable than the 500(imo). Both of those bike will definitely have enough power.
If you do go the cruiser route, I wouldn’t get anything less than 650-750ccs