I'm doing 5 gallon AG batches in the Bayou Classic turkey fryer. Yes, it's only about a 5.5 gallon pot, but it'll get you going. It comes with a burner for about $50. That will tide you over for awhile until you can afford the keggle.
In Process: Mango Beer, Homebrewers Pale Ale
Bottled/Kegged:Spicy Light Rye, Rice-adjunct Pale Ale, Mild Bourbon Porter, Roasty Stout, Basic Light Mead, Bourbon County Stout Clone
Up Next: Berlinerweiss, Chocolate Raspberry Ale, and American IPA