almost all mining hardware öf recent"will work for what you need, but it does depend on your software abilities also... with the wrong software your hash rate will be either hurt very much or may not even work at all, but that is not hardware.
so try to pair the hardware that you use with the software from the time period of when the hardware was released.
the old gridseeds are good for proof of concept and simple to setup and run
good luck
Thanks, that was very useful information. The software is very recent; this one is based on Bitcoin Core 0.17.0 and I'll patch it up for 0.17.1 if it seems worthwhile. I probably should keep up with it since at some stage the checkpoints and chainwork being considered obsolete or even useless will be removed. Seems like a major series of changes are coming before the first non-experimental release, 1.0.
Anyhow yes, I am sure the software will handle the latest gear. Someone just put in a lot of hashpower and sent the difficulty up and very quickly mined 50 blocks in a fraction of the time I did. I have a pool I'm setting up based on the code-base for ecoining (Peercoin pool) and it's fantastic software, so that will be the real test I think, with multiple ASICs pointed there.