Hi Ken and welcome from another relative newie.
From what I have seen on IIS and around the net in general. The advice usually given seems to be "Look at everything then buy the biggest dobson you can handle and can afford"
With a 10" you should be well and truly blown away by what you can see on the moon and see some really nice planetary detail. Right now the easiest and obvious target is Jupiter, rising early in the evening.
I know how what you mean about cars eating spare time. This is my toy
http://www.youtube.com/watch?v=1DkF08pfeEI and I shudder to think how many hours have gone into it, well over a thousand. Another hundred or so to go in over Christmas as it is time for a tidy up!