10" (and especially 12") netbooks are fine for Notepad++ coding, if you hide the taskbar etc. and just use the editor in full screen. Apache might be a bit on the heavy side, so you might, for example, check nginx for a lighter alternative. Eclipse, on the other hand, will be a lot more difficult to use on that screen size and it's a resource hog compared to Notepad++.

There are huge differences in keyboard quality and layouts in the different 10" and 12" netbooks, so you should ideally test one in person before making the purchase. The keyobard, I think, well be the most critical differentiator for you in the cheaper price range.