Yep. Look at the MOTOR for the Hp rating; motor mftrs are required to put accurate numbers on the motor frame. I seriously doubt either unit actually has a 7 Hp motor at that price point. More likely they're 5 horse (or less); a 7 horse motor costs nearly double a 5 horse.
If you can find one, check out a local air compressor repair place. They are likely to have units for sale as well, new and used. And they are likely to have superior brands, like Quincy and Roll-Aire and others. You can probably find a unit with similar performance and cost, but overall a better unit: beefier construction, better cooling elements, etc. I had to replace the check valve in the top of my CH compressor, and got a far superior replacement valve from the local repair place; the quality difference was obvious, and now the thing runs like a champ.
The biggest problem with compressors, like any engine, is HEAT. Their duty cycle is based on how hot they get during operation, which is why they have things like 'two-minutes on, six minutes off'; it takes forever for the compressor to shed the heat. Run a compressor for a minute or so, and the tube going into the tank is gonna be too hot to touch, and will stay that way for some time; ask me how I know. Better units have cooling fins built into the tube(s), for better cooling thus longer duty cycles. You can plumb longer tubes, and some of us have even kicked around liquid cooling, but you get the idea.
An 80-gallon tank is nice and all, but unless you are running die grinders and such, a 60-gallon is probably sufficient, and will take up less real estate. Plus it can be moved; I have to disassemble my 60 gallon to move it single-handedly, but I don't think I could swing an 80. If you decide you need the extra capacity you can get a reserve tank; I've heard of people mounting a large tank (like those warranty return ones) in the attic or wherever to increase capacity. It'll make the compressor come on less often, but run longer when it does come on.
Good Luck!
c.
