Topping MX3 audiosciencereview

Hi,

looking for a small (as in physical dimensions, due to shelf ) amplifier for my workshop/gym. Will be paired with some MA BR1s. Not willing to budge with these (such as buying powered / active speakers).

Ideally will have 2 RCA inputs, bonus if has optical.

Considerations so far;
SMSL AD18
Tangent Ampster BT2.
Wildcard : Cyrus 3i (sub £200 on eBay potentially).

Anything else I should be looking at? UK based so Amazon, richer sounds, Tyson etc