They look pretty reasonable. You might however consider an AMD build.
Phenom II quads and X3's (720 black edition) are serious performers and leave you with a decent upgrade path.
780G or 790GX motherboards will be best paired to these. Personally the 780G (asus -em version) suits all my needs but 790GX might be better for full atx as most 780G's and uATX.
640GB hard drives are worth investing in unless you can get a 500GB single platter now.
P182 is a revision of the P180 and worth the difference unless you do go for a uATX motherboard then the P180 mini is deffinatly worth a look
The CM-690 you list is also a fantastic alternative at a lower cost.
I'd be looking at corsair/seasonic/enermax/be quiet!/OCZ power supplies from persoanl experience.
Graphics wise, the HD4870 will be handy for 1920 x 1200 or higher resolutions, the HD4850 or nvidia equivalent are probably better suited to 1680 x 1050 or lower but will still work well at higher resolutions.