Mizrachi,
If you like the DeCapo and it fits your budget, go for it! I own the DeCapo (non-i version) and it has been in my system longer than any other speaker in my modern Audiophile history. It is very easy to live with, with a smooth, non-fatiquing sound and it also has excellent bass response for a monitor. I actually own a hi-end subwoofer, but I never feel compelled to turn it on with the DeCapos.
However, what Rich said may be correct. You may be buying a speaker that far ourclasses your amp (I don't have any personal experience with the Rotel). But, the great thing about the R3A DeCapo is the fact that it can be driven by almost any amp in a moderate sized room. I currently use either a 3.5 w/ch SET tube amp or a 30 watt/channel p-p tube amp. Either will easily drive the DeCapo to "too loud" levels in my medium sized room. The beauty of this easy to drive speaker is that you will likely never have to change speakers to match your amp. And, there are some EXCELLENT inexpensive low-powered amps on the market today.
Enjoy,
TIC