Buying used: Parasound A21 or A21+ ?


I've decided to get a Parasound Halo amplifier, but with limited budget, i can't afford new, so it's either a used A23 or A23+. I like that the A23+ has a bit more power, but I wonder if the apparently subtle upgrades are worth paying a premium.

Thanks for advise on other amps, but I'm set on a Parasound Halo, to go with my P6 preamp. I like their sound signature, I guess.


sylvanvideo
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I have a similar dilemma: I'm looking to upgrade my Linn Majik 2100 amp to something in the Halo line, but can't decide between the four available options - A21, A21+, A23, A23+. I'm currently powering Monitor Audio RS6 speakers, so I imagine that any of the four amps will have PLENTY of power. The two questions are:

1) I'm thinking to future-proof a bit in terms of going up to A21/A21+. I haven't put much thought into what speakers I might upgrade to, but likely won't be anything too exotic or hard to drive (maybe B&W 702 S2, Focal Aria K2, SF Lumina III, Spendor A4/7, etc.). Would I be going overboard (nearly doubling the price) with A21/A21+?

2) It's not clear to me from reviews, technical literature, etc. how big an improvement the "+" version of either model improves over the older "non+" version. Do I really need to spring for the newer "+" version or will the older version be completely sufficient/satisfactory? It seems that at least the A21 has stood the test of time quite well, so it's hard to imagine I wouldn't be pleased with it. 

A21 or A21+ ? go with the later so there will be no question especially if the funds allow for it.