That's great you are riding! (I've done about 3,200 km since Sept 28th.
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The GS500 is a great bike! I wouldn,t be in any hurry to upgrade.. learn how to ge he most of what you have and you will be a much better rider later. I encouraged my son to get one and rode it a bit until he realized insurance was costing him too much so he put off getting his M for a while. ..as far as I have seen there is no issue with your bike in the wind. Usually people that are having wind issues are trying to control the bike too much, usually by hanging on to the grips with a death grip. Relax! The bike needs to be able to move around in the wind and if you let it you will probably find it stays pretty stable.
..Tom