Options matching 15 ohm LS3/5A to amps?

I've a pair of Rogers LS3/5A 15 ohm speakers. Lately I've been thinking of downsizing my system by replacing my cj MV50/Prem 14 combination with an integrated tube amplifier.

Problem is, most integrated amps I've been checking out on Audigon have only 4 ohm and 8 ohm spkr outputs (the MV50 has 4,8,16 ohm options). I'm assuming I'd use 8 ohm for the Rogers if 16 ohm s isn't available—is this going to be an issue? All suggestions would be very much appreciated.

Thanks and happy holidays!