The XPS-1 (G2) performs way above what any preamp at its price should perform. Thus, go as high as you can afford in matching amps to this little heavy hitter. I actually have a pair of Bryston 7BST monoblocks paired with it (about $5,000 new), and to my ears, it is a wonderful match. The sheer limitless power of the Brystons (and let's be honest, a very slight clinicalness) matches well with the honest "no-frills" sweet sound that passes through the XPS-1. My advice: if you already own a great pair of speakers you love, spend as much as you can on a great amp. The XPS-1 won't be outmatched.
Just to correct, you're talking about the "XSP-1" the analog preamp, the XPS-1 is the small phono stage preamp.
Yes (duh). You are correct in correcting me. Thanks!