Without knowing your tow vehicle, none of us can help you in the slightest. Please share.
You also need to decide what your goals are for this camper. Some folks (me) have a popup because they LIKE the experience of sleeping in tenting and prefer the camper to have minimal complexity (added cost, maintenance and probability of breaking). Others want the luxury RV experience and figure the popup in the cheapest way in (or the most they can tow). This latter group rarely ends up happy in a pup. Best predictor of popup happiness is to spend some time TENT camping. If you LIKE that, but would prefer to eliminate just a few of the hassles (zipper doors, sleeping on the ground, etc), then a pup is probably for you. If you generally don't like tent camping, the pup won't satisfy you for long.