I do a lot of camping, and a few years ago, after renting a dozen different tents, I bought a Sierra Designs Meteor Light. It is the kind of product I just rave about! The design and construction of the Sierra Designs tents is really wonderful. It's easy to set up, has nearly vertical sides so it is huge inside and stays dry( we spent almost 24 hours inside it one day!). They make a tent called the Mondo Condo that is more or less the same design but is a bit larger. The may be a little more expensive than you are looking for, but in 7 years when you still have it you will be glad you spent the extra $100 on a good tent.
Stay away from those off-brand, cheapo "family" dome tents, you will be dropping one in a landfill every 2 years! Look for aluminum poles, taped seams and a reinforced floor. Also if the pole sleeves seal tight to the fly, things will get very humid and wet inside. Do not underestimate the value of good ventilation.
When you get a tent, try to be a little rententive about it's use, especially when you put it away, and it will last just about forever.