By recreational racing, do you mean USSA (not really recreational, but I like it), Masters, NASTAR, town league...? There's a lot of levels of recreational racing, and a lot of degrees in difficulty even within the various categories. A NASTAR course at one resort may be a Masters course at another.
Are you mainly skiing GS, or do you run slalom courses as well? Are the sets open and fast, or turny and technical? Are the race hills steep or relatively tame?
The reason I bring this up is that the course set and terrain has a great deal to do with what a shorter and more shapely ski can do for you. I've found my times on flatter and more technical courses are better with a shorter and more shapely ski (15-18M radius). Some of the Masters I race with have longer Volkl 5 Stars or race carvers like the Atomic GS9 for those types of courses. It's just easier to carve a clean line at slower speeds on those types of skis. However, when the speeds increase and the sets get more open, I've found an actual GS ski is the way to go.
If you also race SL, I would just go ahead and keep what you have for GS and pick up a short slalom with a 10-12M radius.
As for the 6 Star, I wasn't really that impressed with it (vs the 5 Star). A good race-carver off of eBay would probably be cheaper and faster in the long run, and the radius of the skis would be similar. The Fischer World Cup Race Carver is a great example. If GS is the only discipline you're racing, something in the 175-180cm range would probably do the trick.
The best option would be to demo a bunch of similar skis in a course (coin-op or NASTAR) and see what works for you.