I have the 30qt Mastercraft Aluminum with the "Turkey Tap" valve. It was on sale for around $40 at Sears last Christmas.
I however didn't like the Turkey Tap. The bend in it makes it hard to clean. You basically have to remove it and take it apart to get clean, especialy if any gunk get stuck in it. Also I like to use whole hops, and these clog the **** out of it.
I couldn't figure out a good way to use a SS braid with the Turkey Tap, so I just replaced it with a 1/2" straight ball valve/SS braid setup. I did have to drill out the factory hole a little. I used the exact same step bit shown above from Harbor Freight to drill my holes. It cuts through my aluminum and SS pots like butter. If you don't have one, then just use the biggest drill bit you do have, and file out the rest.
I don't have any pics, but it's very similar to the cooler tun valve setup that you can find around here. I can't seem to find a link with pics handy, but maybe someone else around here can post one. All my parts came from Menards, and cost me a total of $10-12.
Now I can use whole hops and drain no problem, and the straight through layout of the ball lock valve allow me to clean it out without having to remove it. I can also now use it as a direct fire mash tun for step mashes
I also did the same thing only without the SS braid to my smaller 3 gal boil pot for heating sparge water.
I wouldn't shell out the extra bucks to get a Turkey fryer setup with a factory valve, because they just don't work as well IMHO as a standard ball lock valve. Just get the cheapest Turkey Fryer combo you can that's at least 30qt. That's a big enough pot to do most 5 gal batches with average size grain bills.