steve is right

your GSOs will be doing quite a good job as it is. if you go for the OUs in the buy n' sell section you'll get better contrast but basically the same detail. a TV radian will give you more eye relief and the magnification you are using or a nagler will give you a wider field of cview...
but if you dont find your gos hard to use (ie your eye being so close to the EP) then stick with what you have ....
it comes dow to what
you want really. wide view? eyerelief? contrast?