I've got an old Velleman PIC kit which is nice, but not laid out very well, the lack of a ZIF socket means I'm constantly stabbing my fingers with the pins, it's also has a rather narrow range of devices which it supports.

It needs to supported under linux, either homebrew or commercial I'm not fussed, as long as it's not too expensive. Serial would be nice too as the parallel port on my dev machine interferes with the USB so it's currently disabled.