Thanks, Tom and Dave, for your suggestions. I've had the 645D for a day now...handling is fine, but, my, it's a noisy rascal...the mirror bangs up with a crack! Would be a real attention-getter during a wedding ceremony...also was disappointed at how slow the SD card functions...but then I forget it's working on 40 mb.
I have purchased a 45, 55, 75, 120 macro, and a 200/4. All A lenses. Total amount spent: less than $1000, thanks to Atlanta's Wings Camera's offerings on eBay. I've tried the 55 and the 200 on the 645D. 55 is very good...200 echhhhh, so far. Tried the 120 macro on the Canon 40D...very fine lens.
More to come as I get into this a bit more.