Really hard to value. Your figures are quite interesting. Thats alot of unique visitors. Even apart from that I like the word the meaning has potential end users.
I think it is definitly in the $XXXX range quite possible the higher $XXXX or beyond.
I actually don't see a lot of value in this name, outside of the traffic. Looking at the site, how are you generating those sorts of numbers?
Anybody could potentially get an end user sale worth $x,xxx but I'm not seeing a ton of potential areas of use. you will have a tough time selling this name for more than low to mid $xx in the reseller market. IMO.
Looking at the last 30 days:
12,104 from stumbleupon
3,037 direct
105 google
27 quotegarden.com
10 facebook
6 delicious
And the rest are 5 or less from various sources.
SERPs are pretty good for this one eg
Searching the word contemplate gets 7th place on Google (out of 11million) and 6th place on Bing. Searching take time to think yields 2nd place on Google (out of 68million).