Suggestion on what size bike to buy

I have been riding quads for the last 7 years and have not ridden a dirt bike for probably 17 years.

With some many great prices on used bikes out there I am thinking about getting a dirt bike to play on.  However, I do not know what to get so I am hoping for some advice.

I will ride trails and in a sand pit.  I like to climb the hills and do some small jumps in the sand pit.  I am 40 so I am not going crazy but like to have some fun.
I also ride at night some times so I want a light and electric start.  I am 6' 1" and 210 lbs.  I am looking for a 4 stroke, not to loud to bother my neighbors and something reliable that with normal maintenance will just go. ( I know no guarantees )

Would a CRF 250 x work for me or would be be two small.  Should I go to the 400 or 450?  I normally would lean torwards more power but I also want it small enought so I can handle it and the 250s are really cheap.  I am probably looking at a 2000 to 2004, any recomendations will be appreciated.

I posted this in another thread but someone suggested I start a new topic so I am posting this.  

A 250X sounds great to me. A Yamaha WR 250F would be a good choice too. I think the 250 will be plenty for you. I could be wrong but ive always heard its hard to use all the power in a 450 anyways. So unless your a pro, I'd deff go with either of the above 250s  
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Ben
2007 Yamaha ttr-125le

ditto ben  
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Brand new yammi 450 =  $7399
To see a honda burry it at the track=PRICLESS!!

Thanks !!!!  

That sounds like a perfect choice. CRF's are good reliable bikes and a 250 would have enough power.  

try to go as new as u can  
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live fast ride hard
NOR*CAL
YZ 250

try a 250 4 stroke or a ktm 150, ktm 200 or get a cr125r  
03 cr125r

this post is 3 monthes old, but 04 CRF250X all the way. couldn't be a better one for your riding.  
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Lancaster, PA
2007 CRF250R
4 Stroke 4 Life!