Need Help and Info,

need help findin a bike for my size

new to the site, need some advice..
I currently ride a completly stock 02 yz250, best bike Ive ever had.
But the problem is im just to big for it.
I currently am 6'7" and about 200 pounds.
Ive cranked down the suspension so I dont bottem it out anymore, but i still look like a half opened pocket knife.
I need any suggestions on other bikes, or mods that i can do to my Yz just to make it more comfortable to ride.
I like the Blues and Reds. but will consider other brands if their bigger.
lookin for the biggest seat hight possible, and somthing with more power. Im pretty agressive, and can do all the mech work myself.
Ride mostly trails, and track.
any suggestions would be appreciated

any opinions or suggestions would be appreciated.
thanks

1) your physical size (both height and weight are important) 6'7" 200 pounds
2) How physical / aggressive are you ? pretty agressive
3) what do you plan to ride- MX/SX tracks, woods, fields with friends or ????? all of the above, hopefully start comp racing soon
4) Do you have any riding experience? yes
5) Do you think you will race ? yes
6) Are you mechanically inclined and will you be doing your own bike work? yes
7) Do YOU have a preferance to a brand/ motor choice (2 or 4 stroke)? i like the 2 strokes, never ridden a 4 stroke. like yam and honda
8) Do you have a dealer close by your home that you might use and what brand(s) does he carry? yes, honda, ktm dealer
9) How much ($) do you plan to spend on a bike? under 7 grand
10) Do you live in California? no
11) Your age? 21
12) anything else that you think would help form an opinion
somthing big, with a more power than a yz 250. tall seat hight would be prefferable