hey bro... sorry i missed your call again. i'll try to call you tonight.
you definitely want a 450 if you get a dirtbike. any smaller and you'd probably crush it brotha!!!! you can find 450's all the time on craigs list that are within 2-3 years old for 3-4k. no need to spend 6000 unless you really want a new one.
i don't really have too much preference. i like my YZ. the new kawis are pretty sweet. fule injections would be tight cuz then you can change your fuel mapping esier that pulling the carb and changing jets. i've always like honda's too. i haven't had a suzuki for a long time but i kinda like the look of those these days also. just find a good deal and try to find one that hasn't been raced to shit. you dont wanna blow a motor right after you get it.
theres lots of good deals around if you look. people losing jobs and houses and needing money are selling their toys for cheap!!! so be patient and look around for a deal.
thats my $ .02
here's an 06 thats already setup for a bigger rider for 3600
http://denver.craigslist.org/mcy/1168533456.html