Get a 40L urn, no less. I got a birko off ebay for about $170. It has an exposed element but I cover that up with a stainless steel strainer/colander. It's not glamorous but it does the job. I got my bag from Gryphon and am still happy with it after about 30 - 40 brews. (Honestly don't know how many I've done but it sounds about right). I know Craftbrewer also do a bag, check the website link at the top of the page. I got free shipping from Gryphon, but I think Craftbrewer bags are cheaper, either way you will have a good quality bag.
I've heard the crown urns are good too, or you could get a 50L keg, cut the top off and get a gas burner. For me, all up I got AGing for about $220 and haven't upgraded in two years. Urns are good because it's a cheap way to get into AG and will serve you well. They don't get a vigorous boil but a steady rolling boil. I'm not sure about the impact that has, but my beers turn out ok.
After mash out, I chuck the spent grain and throw the bag in the washing machine using the "delicate" wash cycle and by the time the wort is boiling the bag is ready to be reused as a hop bag. I hang the bag off a hook about a foot or two above the urn. The hook comes in handy when I sparge the grain too.
The main problem with my set up is I can't do double batches in one go. I will eventually rectify that once SWMBO gives me the go ahead. Right now a keg set up is more important for me. I brew on the back deck with all this gear too, so go for it mate. You'll never look back. Welcome to the dark side. :icon_cheers:
Bowie