I'm quite looking forward to getting a pair of Monkey Banana Turbo 4:
What I like about them is their frequency response of 60 Hz - 30 kHz, and overall user reviews seem to be very positive. To me at this point they look like the best choice: even if rear port is not something that I would normally prefer, so far I don't think I know a pair of similar quality portable speakers (maybe Genelec, but price ). Currently I own KRK KNS-6400 (which are headphones), and a large 2 х 0.15 kW soundsystem, with frequency range I was quite blown away with when I discovered, @ 35Hz - 45.5 kHz.
Speaking about some other models, if you don't mind high-frequency amplifer noise, I had a chance to audiition a pair of Tannoy Reveal 502, and sonic quality-wise they are well impressive, my music sounded exactly like I would imagine it should on them. Pretty crisp highs, adequate low end, no distortion throughout the whole frequency range, and response was really flat. Plus, while these are professional studio monitors, they do not sound any dry, and you can enjoy them for casual music listening, which is nice. And Tannoys in fact are probably the first brand I discovered, going up there to ultrasonic frequencies, even with a smaller 402 going as high as 48 kHz (& starting at 56 Hz).
Still, with them being a nice pair of speakers, constant hiss is too much a show-stopper to me, and I can't quite see an excuse for it being present in a professional pair of studio speakers. It's like this little surprise you never expect, and then you come to your friend's, & be like "what the?"
So, as much as I was chasing after a pair of Tannoys, at this point I came to conclusion that going Bananas is probably a more reasonable decision in the long run