Older switches vs newer switches. Any substantial benefits for a small, niche company?

I'm wondering what are the downsides of buying older networking switches, compared to newer ones.

We have minimal needs, maybe 10 devices per switch, 1Gbps links, with the option to upgrade to fiber at some point. The only real feature I care about are VLANs.

What benefits will I see investing in new equipment, as opposed to buying a HP ProCurve 2824 off eBay?

For just a bit more information, we only create LANs for small clusters of computers, no internet, no VOIP, only a couple VLANs to segregate some hardware specific protocols.