darkhunter, do you know how big of a mid you can place in your door? I think it's 5 1/4" for the Accord but I'm not too sure. My '98 Civic fits the 5 1/4" easily but had to do some modding for the 6 1/2s.
Anyways, I think you can get Rainbow SAC 230.25 or SLC 230.25NB components for around $200. Here is the link for them:
http://car.rainbow-audio.de/products/details.php?lan=2&pro=1&lin=7&art=231414. In order to get Rainbows, PM 3.5max6spd or 6spdcoupe to find how much they are. Both I suggested are for 5 1/4" mids but they also come in 6 1/2s as well.
These will be MUCH BETTER than the Polk dBs you were considering and 100x2 should make them sound great. 6spdcoupe posted pictures of them in the thread here:
http://www.caraudio.com/forum/showthread.php?t=277093. Looks like the 6 1/2s are $255, so the 5 1/4s should be around $20 less, which isn't too much over your budget and you shouldn't have to upgrade to new components after that.