At the level you are looking at, it's all good. ARC, however, has been around a long time and will be around in the future should you need servicing or take advantage of upgrades as they become available. Also, the GS series is just so good looking (personal opinion). Matched up with an ARC preamp of the same series and you are at the top of the audio world. You could spend more, and get less at this point.
Which amp to buy? ARC GS150 or Reference 150 SE?
So any thoughts on which sounds better? I like the meters on the ARC GS150 (easier for bias adjustments) but the Reference 150 has no meters. How much of a pain is it to bias the Ref 150? Do I need an external meter to bias the Ref 150?