I find these suggestions are a little unexciting. Personally, a computer with no SSD is not an option. At $500 it would be a difficult find, but even for browsing the web and doing email, word processing, etc. I find a computer that requires more than a few seconds to do anything intolerable. Dealing with defrag, slow caching, all that garbage should not be part of computers in 2015, imho. Spending all day on a high end computer and then swapping to an old laptop with a noisy, slow HDD just makes me want to toss said laptop from a high place.
The Sky Lake laptops are just hitting the market starting yesterday, so give it a little time and even if you don't find a sky lake laptop that suits your purposes, the broadwell laptops will be going on discount more and more in the coming weeks.