Most inexpensive good amp for D2Ks?

I'm currently using the Denon D2000's out of a Zune and a Fiio E5. They sound great to me just with the E5 powering them, but from what I heard I'm missing out on the full sound I could be getting with my Denon's. I bough a PA2v2 but the E5 powers my Denon's just as well. I just ask for suggestions for an amp that would power them well without spending too much money, I'm not going to set a budget but I'm not going to buy the best amp out there, I'd just like an idea of an amp I could get that would be just good enough to power them well. I've heard good things about the LittleDot and E7/E9 combo. I'd also like other suggestions as well.

A few more things, I'd like an amp that will give me a good amount of bass, and I'll be running it exclusively out of a Zune HD so I don't need a DAC. I'll make a budget around $200.

I've also been looking at the Ibasso T3, can anyone comment on that?

I've also been looking at the ibasso D4 Mamba.

To the above post, how would I connect that amp to a Zune?

I've been looking at a lot of iBasso amps too, and the Meier xxs.