I have a XC300 and a TE 510 Husky which was my main ride until this year. The 510 was a rocket on D/T and very solid on the S/T stuff, but by the end of the day I felt pretty beat up throwing all that weight around. I still take it up in the hills but mostly used for back and forth to work. It has it's purposes and is very good at it. I love that bike.
The XC is by far the best enduro I have owned.
I had the front suspension re-valved since day one and now the bike glides over anything I throw at it. It's nimble enough to go anywhere my GG TXT goes...almost plus as a bonus has a seat.
I wanted the magic button and was a little apprehensive on getting the 2010.
But this thing starts first kick and with running a 52 in the back never stalls...hardly.
So, get the 300, but keep the 450.