For the time being (until you get Nikon Capture, see thread thereon below) convert your RAW full size, but keeping the original as Walwyn says. In PS(E4) use 'save for web' and adjust first size to 1024max width &/or 768max height (to suit most folks screens) and then quality slider until file size gets below 300kb and use file name with R suffix or something.

Being a Canon & mac user and PS hater can't help in detail, but from a brief play I had with Nikon capture (you should be able to get 30 day free trial), everything can be done with great precision and intuitive interface there without going further, except maybe to correct horizontals (as with Canon DPP).

Look forward to those pics coming through