HDDs in any way, shape, or form, don't belong in laptops these days. SSDs have not only dramatic performance advantages, but also significantly lower power consumption and reliability.
Don't know the specifics involved here, but sometimes its a better deal ordering a laptop with the lowest-specs available, and swapping out an after-market SSD. But with the complexity of some laptops, particularly non-business ones, this isn't a trivial endeavour. Care to tell us what you're looking at buying? Paying the extra $50 might be worthwhile if it is, for instance, a MacBook or some other known-to-be-notoriously difficult model to integrate an aftermarket SSD into.