@lavii,
Do you have a budget in mind just for the amp?
I've read good things about FiiO E9. It has lot of power, but it does have a high output impedance of 10 ohm, which would make it tough to match it with your existing IEM and headphone collection (Only HD25-II has 70 ohm impedance, rest are lesser which means their sound signature might be changed).
Matrix M-Stage v2 with Class A biasing -
Matrix M-Stage amp review: simple, cheap, and excellent. - is something you can consider. I am somehow never sure about the build quality of Chinese products. They seem to be a hit or miss depending on whom you ask. That said, M-Stage has garnered good reviews as a budget headphone amp.
@Arihant.EXE
If restricted to local buy, I think it's down to uDAC-1 or FiiO E7.
If you are not averse to buying ICCWorld, you can try HRT HeadStreamer. I am basing this on my experience with HRT MSII. It would be interesting to see what they did with a DAC-HP Amp combo.
If PC/Laptop is the only source you are trying to pair the DAC with and/or you are looking for a small/portable amp, those would be the choices off the top of my head. Otherwise, you can get a DacMagic locally. They have recently come out with DacMagic+ -
DacMagic Plus Digital to Analogue converter. Not many reviews so far to go by though!