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Any recommendations so I can look into it and do some homework?
Well, your best bet if you want to stick to the NEX system is the new Zeiss, at least that's what I would guess. The other option would be the ZM25/2.8 - a little bit slower and manual focusing, but it can be used on other cameras also, if you do not want to be pinned down to the NEX system. Of course, there is also the Leica Summilux 24/1.4 ASPH, but that is a lot of money into only one lens ( true, a nice 35mm equiv. ), and the discontinued Elmarit 24/2.8 ASPH. And the 25/4 Voigtlander that is small, but maybe not the best performer.
Of course, you can also think about every SLR lens from the little Zuiko's, to the Nikkors and the C/Y Zeisses for the NEX, but the adapters are already a little big, so even a little lens in SLR terms will be pretty long on the NEX with adapter.
If you target the NEX-7, I would say you should still stick to the Zeiss 24/1.8, at least from what we know at this point.