Cheers Thrax, it sounds like I'll have to stick with a slower HDD for now. Once the price of SSDs comes down further then perhaps I'll re-consider and go for one with FDE encryption built in. There are a few around at the moment, but they are too expensive to make it worthwhile for a low-end laptop.
I hardly use it, but when I do it's because I'm away travelling and don't want to risk having someone access my data. I guess I'll spend the £80 saved from this purchase on coffee each time I wait for the laptop to boot

.