Originally Posted by pmc
It's a bit difficult to recommend the Chameleon as it's not out yet and I haven't used it but it is supposed to have more features when it's finally released. If you're not going to use those (REU, accelerator, VGA output etc.) though then the 1541 Ultimate is still a good choice and, from my experience, works just fine.
The Chameleon is out since some weeks, a second batch is now available on Vesalia. But you should wait to order, since the software is still beta and not really practicable.