4 hottest recent enthusiast/"prosumer" cameras are: sony NEX-7, fuji X-pro1, fuji x100, olympus OM-D
olympus has m4/3 sensor and mount...smaller of the lot (which are APS-C). a bit over a 1000 with kit lens + 500 for a nice prime
fuji x-pro1: functionally not that much better than x100 except it has has interchangeable lenses... some very nice ones. substantial cost relative to ur limit
sony nex-7: decent lens selection. decent body.
fuji x100: my pick of the litter. fixed 35mm (equivalent) f2.0 lens. very back-to-basics. best handling/controls. and also the best on-camera flash in the business should you choose to use it. has *some* problems with low light focusing. killer ISO performance
the olympus has the best low-light focusing of the group, but the worse ISO performance... there's your trade-off
nex-7 has focus peaking feature, which is really nice.
but still, i would go x100. price is 1200