Personally I would drop an extra hundred and go with a 15 gallon pot, this way you can upgrade to 10 gallon batches when you are ready, and trust me you will want to at some point.
However, if you want
to have to buy more than one brew pot I think this place has quality pots and free shipping.
Like I said though, I would drop the coin on this one:
Buy smart, buy once, save yourself some money in the long run, plus you wouldn't even have to consider keeping an eye out for a boil over with a 5 gallon batch in a 15 gallon pot!
I do have the 15 gallon pot listed here, and I am extremely satisfied.