I bought the A-iPower SC2000i from Costco a couple years ago. I think it was $450 on sale back then. Great form factor, but it's more difficult to start than I'd prefer and at this altitude (lose ~3.5% per 1K feet) it's not very powerful.
Picked up a pair of A-iPower SUA2300i on sale at Sam's Club. I'm really impressed with them. Especially for the price. I can also link all 3 of them together.
Just picked up a little Ryobi 900W propane ($250 at Home Depot) for charging batteries. I have to say, I'm pretty impressed with it so far.