I went with DeLisle. It has everything I require and noting I didn't. Since it doesn't have MIDI and and uses analog switching it made it the least expensive option. Quality wise it's on par with everything else and I haven't had any issues with it.
KHE, Ampete, Delisle, and Kahayan are the main brands. You really can't go wrong with any of them as they're all rock solid. Your biggest deciding factors are going to be which features you require and how much you're wanting to spend.
I would also suggest planning a little for the future. You said you want a 3-4 amp swithcher. You may want to invest a little more in one that can accommodate more heads. That or one like the KHE that can chain multiple units. That way you have some room to expand later on if you ever do.