ARC LS-5 vs SP-10/11 for Plinius SA-102

Need a preamp for my new Plinius SA-102. The Plinius is expensive and my budjet for a preamp is therefore small. I am aware that classic ARC preamps (tube) are still very good. After reading some reviews and threads I have concluded that ARC LS-5 and SP-10/11 are the most interesting models. The SP-10 seems to be the best (is it?). But I really need a word of advise here. I am not using a turntable so phono is not an issue. So, according to you, which one among these preamps is a better match for the Plinius (and why)? Thanks.