Man there are so many options out there, it really just depends on what features you like. Economical, durable, & weight are the 3 big ones to consider. Rarely will you find a perfect blend of all 3.
I've got a couple of Big Agnes tents that I am pretty partial to (Seedhouse SL1 & Emerald Mountain SL3), but I also own a 12 year old Kelty tent that has never let me down.
3-4 years ago MSR was having a lot of trouble with the floors on their Hubba tents, but I'm sure they've got that fixed now. I wouldn't hesitate to buy a new one if your heart is set on one, but I would definetely steer clear of any MSR tent marked as clearance or used.
If I were buying a new tent today, I would probably look at the thickness of the floor material (compared to others) & the thickness of the rainfly, & if its sil-nylon, I'd try to get some Hydrostatic Head test results. This will give you an idea of the amount of rain it would take to create a "misting" effect inside the tent.