Thanks all!

With regard to the "official wallet" mentioned by Gianluca95, I believe this is the Qt (or 'core') wallet that I already use, but please correct me if this is wrong? If it's right, then, like I said, it delivers transaction change to different addresses, not my main address, but I'm looking for other wallet options that DO deliver transaction change to my main address.

Again, I'm wondering if there is a good PC wallet that...
- constantly synchronizes the blockchain (like Qt does), but...
- delivers all change (after spending) back to my MAIN address, so that I can keep all of my Bitcoin at just one address?

I appreciate the info from cech4204a and joshraban76 about Multibit and Electrum, and I've spent the last little while reading up on them (and others), but I was unable to determine if either of them meet both of the criteria that I mentioned above. Does anyone happen to know off-hand if they (or any others) do?

Thanks again!

Steve