I think the DH-110 is the one to go for. It has two phono inputs and some other useful features. Plus, it sounds pretty good.
I believe I tried the DH-101 (owned one for a short time) back in the day and didn't think it sounded very good despite the positive reviews. Also, the pushbuttons were plastic pieces of junk that either fell off or otherwise malfunctioned due to their poor design.
The DH-220 was a decent sounding amp, as I recall, so I'd either pair it with a DH-110 or a different company's preamp.
I believe I tried the DH-101 (owned one for a short time) back in the day and didn't think it sounded very good despite the positive reviews. Also, the pushbuttons were plastic pieces of junk that either fell off or otherwise malfunctioned due to their poor design.
The DH-220 was a decent sounding amp, as I recall, so I'd either pair it with a DH-110 or a different company's preamp.