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Boy, that's a stumper, all right . . .
Based on the pros/cons you gave, the Yammy is a better performing system, but the size/weight/price are concerns.
So,
1. Can you afford the extra $$? If so, price is no longer an issue.
2. Can you arrange extra space for the receiver? buy a side table, or something along those lines?
Up front, I don't know much about Rotel, but your questions suggest that you think the Yammy is a superior unit. So if you can adjust your computer work area to accommodate the extra size and weight, that would be the way to go. If you can't, and you can't manage with the larger footprint, then go with the Rotel.