well if you want to go that route you can. The g90 at my lhs is 80 bucks, but depending on the store they might go up to 100. I'll link a video of what the difference is between HH and rat4e gyros. Basically it will take the aspect away of always having to fly the tail so you can learn to fly easier. IMPO unless you are crashing alot, go without it for a bit and learn to fly the tail, it just might make you a better pilot. When you step up more in flight then I would say go for it =)

http://www.youtube.com/watch?v=_TLD8CqsN0M