The new Knights are very nice...as good or better than anything they've ever made. The only drawback is the price that has increased. Right now they have some pretty good sales going on, and you can look at places like sportsmans warehouse or sportsmans guide and find fairly priced rifles often.
The best ignition imo, is the bare primer setup. Properly spaced you will have a tack driving, zero blowback rifle. I am partial to thumbhole stocks personally, have several Knights wearing them. They are very nice, and just "fit" me. Obviously its best to handle one if possible, you may not like it as much as someone else. Worst case if you bought it and absolutely hated it, you could sell it and buy a regular stock, or even trade if for a regular stock.
My preference (for my hunting style) is the UL. But its a good bit more than an Extreme. I like the shorter ligher configuration, but certainly nothing wrong with an Extreme.

The other option would be to find a used/like new rifle. They are out there all around, very fairly priced.