[KnightStalker]

I caught a few of the older seasons online on YouTube, and I've watched episodes from the 2005 - current online and on BBC America and SyFy (I still hate that new change in spelling, to me, it'll always be Sci-Fi Channel).

I personally liked David Tennant's Doctor the best, but I feel Matt Smith's done quite well at keeping his Eleventh Doctor close to how David played the Tenth Doctor.

I also think that the modern SFX help the show tremendously, the older season's Daleks were so limited in the evil they could do, what with the lack of flight capability (that's the problem with how early SF shows had such limited low budgets, they just couldn't do as much back then).