I'm a huge fan of the Mellotron, its probably my favorite keyboard instrument. I've seen recently that Streetly is making a new model called the M4000 thats much improved and has a cycling system with 24 sounds. But I also read of another one they're making called the M5000 which is a dual manual version. Searching on the internet, though, I found no pictures of it. I'd really like to see what this beast looks like. I'm not sure if it'd be more like the giant Mark V or the Mark II. The Mark V is probably my favorite of all Mellotrons, it just looks awesome.
I know I'll probably never own a Mellotron, unless I get rich