I got a little 478W unit. It's pretty handy. I use a 40W solar panel to charge it. It was about $95 on sale. I don't recall the brand, but can get it if it helps.
There's just too many options out there that are good to list. Costco had a DuraCell brand on sale a while back I think. I use a Bouge RV 1000 model that I use very frequently (even run a electric weed eater off of).
4 things you need to look at:
Capacity of battery (runtime of devices you want to run)
Wattage requirements of devices you want to run
Connection types you need (i.e. 12v, 24v, 120v AC, usb, barrel plug, solar, etc.)
Budget limit