My first question is whether you will be carrying the tent while backpacking, or driving up to a spot and throwing the tent up right there. If the former, you want to spend quite a bit of time researching what materials are both light and durable – these will cost you more money. If the latter, you can probably get away with buying the cheapest thing at whatever big box store sells tents, and still have a good tent that lasts you years (and because it’s cheap, it’s easily replaceable).
So, if you are shopping for a car-camping tent, it is mostly going to be about style. You may want to spend some money on specific factors that please you, but have little to do with necessity or durability. You’ll need to think about them in terms of who you are going with and what conveniences you’ll want. Your main concerns will probably be (1) making sure it doesn’t take up all the room in your trunk and (2) making sure you can put it up and take it down quickly.
Questions you should ask yourself:
—What seasons will you be camping in?
—Do you want lots of airflow, or little airflow?
—How many people will be sleeping in the tent?
—How long do you want to spend putting it up and taking it down?
—How many doors do you want?
I would strongly suggest going to your local MEC or similar store and look at the sizes / materials / prices. That is, not a boutique camping store, but an outfitter for real people with realistic budgets and with a solid returns/repairs policy. They will help you find one you want, and talk to you about maintenance if you like.
If this is your first tent, specifically ask how hard they are to put up and take down. I have a tent like this. It is laughably easy to assemble and take down. The poles literally assemble themselves. The whole thing goes up in under 5 minutes. You want a tent with poles that look vaguely like this – with a cord that connects all the poles, so you only have to stretch them out and let them snap into place. Your next question in terms of ease of assembly is: how do the poles attach to the tent? If you look at the tent while assembled (as it will be in the store), pay attention to where the poles go – will you be able to figure this out easily after a day’s driving, when it’s getting dark, you’re hungry, and someone in your camping party is probably whining about something? If not, keep looking.
As others have already said: get a tent for at least one more person than you’re planning to have in the tent, because these estimates are always too high. However, don’t go for the biggest tent you can afford, because the space in your trunk is at a premium, and if you plan to use it for sleeping in solo, you don’t want to have to carry around an enormous tent for no reason. So, if you’re two people, a 2-person tent will be snug – but if you plan to sleep in it solo a lot, maybe it’s worth being sardines for one trip, especially if you have two doors in the tent (this allows each of you enter and exit on your own side).
And, also as others have said, the life of your tent probably has more to do with how you treat it than what you buy. When you wake up in the morning, the first thing you should do is to remove the fly (the thing that drapes over the whole tent), shake it out, and drape it over your car or a picnic table, wet side up (preferably in the sun). This lets both the fly and your tent dry (it will be very wet on the inside surfaces because of your own body heat). Have breakfast and all that stuff. When you’re ready to leave, take down your tent and pack it up. If you can’t get both the fly and the tent dry within that time, remember to take them out of their stuff sacks when you reach your next destination, and let them dry out properly. If you pack a wet tent and leave it for weeks, months, or years, do not expect to have a useable tent when you unpack it. Also… if you don’t buy the tent footprint (a lot of people don’t bother), then bring a cheap blue tarp to put either under it or inside your tent if it rains. The floor of your tent might stay waterproof the first night you camp, but sometime soon, it will start letting dampness through if you don’t protect it.
That’s all I can think of off the top of my head… but I do wonder: this is February. When are you planning your trip? Have you camped before? I’m curious to know whether you need advice about keeping warm.