I'm a big fan of most things Sinclair but the QL is one of my favorites. It's a pretty obscure computer compared to the Speccy or ZX81 but it's well worth a look. The QL supports multitasking and was the first mass market computer to use the 68000 cpu beating the Amiga and Apple Mac.
Unlike the C5 scene which seems to be growing rapidly, the QL scene could do with some new faces to bolster the numbers. So if you fancy a retro machine or a bit of Sinclair kit to tinker about with please check out the QL
http://www.qlforum.co.uk/http://www.youtube.com/user/QLPeet
info@C5Alive.co.uk