avantgarde UNO nano seeking a matching amp

I am using AVG Uno nano with cary 300SEI integrate amp. it has a sweet sounding character which is hard to stay away from, however i do miss the authoritative bass notes which is lacking in my system. i am looking at an opportunity to change amplifier sets up. can any one who have experience with AVG speakers give me some pointers of the following amp shortlist? [Audiopax 88 stereo, Avantgarde model 5+ or model 3, First watts F3] selecting the avantagarde integrate will save me from buying another preamp but better musical satisfaction from better top to bottom coherance is my top priority at the moment.... need help