Ouch... refurb laptops in Amazon are really pricey...
I remembered the last time I bought an EliteBook 2570p (from a private refurbisher in eBay of course) and I ended up spending £110, comes with i5-3320M, a single 4GB DDR3 RAM, 320GB 7200rpm HDD, a fairly healthy battery (2-3 hours) and a 65W power brick... Then I spent even more than the cost of the lappy on the upgrades but that's not the main subject.
Anyway, Amazon's refurb laptops are just overpriced IMO. If you're a bit confident to further upgrade your lappy then look for private sellers in eBay instead, and even if it ends up DOA you can open a case, which eBay mostly side with the buyers as long as you have enough proof.
P.S. Just in case you don't know, 2570p is a generation later than 2560p in one of the links, so for only £110 it's a steal.