New/Used Amp recommendations for about $3k-$4k?


I'm looking some new Paradigm Founder Series 100f speakers and would like to get rid of my Emotiva UPA-1 mono blocks for something else. 

I really like the form factor of these amps and have been very happy having them and they will make the next buyer happy also but I want some thing very detailed and clean. 

I just got rid of Emotiva XPR-1 mono blocks after hearing the 100f's on them and could absolutely hear the detail and cleanliness those amps had with these speakers. 

What do you think?
todd1010
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The stereo's will be fine with that loading of around 1.5ohm, but the bridged mono's will not.
As bridged amps only one advantage, "more watts" but all other parameters that make an amp great go backwards, especially stability and low impedance drive capability.
Cheers George
any comparison advice Krell to Curl?
Earlier D’Agostino designed Krells yes, later not so great.
Cheers George