Moon i1 I.5 220i 250i 240i 330A differences?


I want to buy a used moon integrated. I am looking for a bright, immediate Fast and open sounding integrated or power amp that will energize warm rounded speakers 89db 5.8 to 60 ohm.
the internals of 250i and i1, 220i and I.5 look exactly the same but I have read somewhere that the newer neo series 220/250 sounds brighter. In both cases I am concerned that these Amps might have reliability issues as they do not have cooling fins. 240i and 330a do.

I am looking at a Sugden a21se (single ended class a) too. 
Do the 50w (250i/I1) vs 40w (220i/I.5) even make a difference with my Easy to drive speakers ?
zuio

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