Seeing the area in different seasons can also be useful if the market is not too hot. Knowledgeable developers and their staff welcome return visits. Compare apples and apples. Yes, each home is unique but how does each unit measure up against your specific needs. Compare on more than square footage.
Location still plays a big part in future value.
Be wary of salesmanship. They may also create urgency to buy when none exists. Spend as much time comparing quality of construction as you do decorating details. Soundproofing, insulation and non-allergenic materials and techniques can add significant comfort but are difficult to add later. Features that can not be afforded now can at least be roughed-in for future installation.