Running a set of NHT 2.5I

Yea I'm afraid that I am going to have to upgrade my amp to get the performance I need out of these.I can still use the yamaha for my home theater stuff if I add a amp right?

I was looking on audiogon for a used amp around $400.00 anyone have a suggestion?B&K ST2140
Rotel Rb1070,Rb991, Parasound HCA-2003,
Parasound HCA1500A'
McCormack DNA .5 Deluxe
Classe 70 power amplifier
Here are some of the amps I like.Which do you think would be a good match?I could use a 2 channel amp to run my 2.5 and then use the yamaha to power the rest of the speakers for movies right?

What do you guys think of the Cambridge Audio 640a Integrated Amplifier?

Thirsty93
I run a McCormack .5 Deluxe on my 2.5's and it really brings out the best that they have to offer. Also if you happen to come across one try the Aragon 8002 but those are hard to come by.