I've worked my way up from a 2 turntable, 4 + 6 watch winder, to a 4 turntable, 8 + 8 watch winder to my current one, 12 turntables, 24 + 0 watch winder.
First one I found for about £80 IIRC, the second is a lovely quality item, cost about £250, the last one cost less, I got it for £220.
The last one is a vertical winder:-
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=370987947782
But i've still got my first watch box which holds 20 watches, enough for the manuals and quartz watches.
Do you want a winder for 4 watches on 2 platforms, or 8 watches on 4 platforms or a 4 platform winder that fits one watch per platform?
My 8 watch winder is going spare at the moment, but it is a quality item, as new, and normally costs about £800, so I'm asking what I paid for it really. I'm not really bothered if I sell it or not as I'm sure i'll fill up the 24 watch winder before this year is out.