Onix OA21s

I have the opportunity of buying either the Onix OA21s ($350) or the Densen Beat 100 ($600). But I really don't know any of the amps. Could anybody please advice me ?

My current setup is a NAD C352 amp with NAD 521BEE cdplayer and Micro Seiki BL-31 w. Grado Silver p.u. and NAD PP2 RIAA. My speakers are Rega Jura.

Thanks !
I owned this int amp for about 10 years and was very happy with it. Solid, totally reliable, very clean sound with non-fatiguing highs and excellent resolution.