I LOVE Doctor Who! I'm currently watching all the classics (they aren't that hard to find, I can dig up a good link if you want) after I found out the season was split in two (I had known but forgot, so it was a shock when I remembered).
The last episode was !!! no words could describe it. I didn't see who River was at all until she told Amy.
I don't have a favorite doctor. I of course started watching with 9, but I don't like him that much. Tennant was amazing, but it all started to get very serious with him, too sad, but the acting was superb and I loved how quirky he was. I had my doubts about Matt Smith, but his first episode is one of my top favorite episodes. He's much more cheerful and although he doesn't ramble as much, he has very bizarre tastes and I love his whole outfit

I've already got myself a bow tie and I made my own custom screwdriver from a laser pen a few months back. I also got my mom to knit me a super long scarf (although not the same colors as the 4th Doctor's). My current favorite Doctor is Peter Davision, but this changes as I watch more and more of the classics.
Back to Matt Smith, I liked the first half of this season, but there seems to be something missing. Everything is much more serious again and there are just WAY too many questions about what's happening. I did enjoy the Silence (scariest monsters yet!), and the Tardis Episode, but I have high hopes that when the show returns I'll get all my questions answered in a very satisfactory manner. I love Doctor Who because of the fact that at the end everything ends up making perfect sense, it just astounds me the complex plots the writers come up with. Amazing.
PS: I too thoroughly enjoy the soundtracks. My favorite is "Every Star Every Planet" (I'm pretty sure that's the title.)