I find this interesting, but:
450 words? that's a lot! If you want quality text (as you state you want) a lot of us needs a lot more than 5-10 minutes to write you something that is above shit. (At least when one is not english-speaking, as I am)
I will submit some articles to see how this works out, but couldn't you lower that 450 words a tiny bit?
And also, when I wrote a piece on MILF, when I tried to find blogs to submit to, I must say I didn't find that many blogs that fit my theme.
I am not meaning to be negative, this is just my thoughts...
Best of luck anyway,
M

rten