Thanks Ben, you are supporting what Vis1 is saying and what I had suspected. The D100 can do the job but you have to find your way with it. That's no big deal.
I spent 1 and half hours today running back and forwards to the lab and I'm really at the end of my tether with it. My plan was to get a DSLR in the spring but I can see me doing it before Xmas. I'm at that point were I still have a full time job but do professional photography in my spare time. Trouble is, I'm out of spare time so I have to take anything that will speed up my workflow.
I don't know if you pros find this but the time spent actually taking pictures, for me, is about 20% of the total project cycle. The rest of the time is meeting clients, processing, printing, framing, invoicing, ordering, marketing etc. A lab screwing up a job or taking extra time really causes me problems (is it the UK or are labs everywhere run by people who can't organise themselves).