Ditch it all. Go to the classifieds of different forums. People going FBL, do they are selling their gp750, 780, 790 for under 40 bucks. You will not have to touch that gyro for anything Once it's installed.. ... It's ROCK SOLID!
I have used ga250, gy48v... They are decent for the price but all in all, you'll see ga250 is a bit moody.. It holds good , but moody lol.
Gy48v is good but it doesn't like temperature changes. You have to let it acclimatize to new temperature going from cold car to hot outside or vice versa, or it tends to drift... As soon as you are over the hovering stage, you'll need a gyro with a very strong hold.
I was a firm believer in cheaper the better lol.. Still am.. But gyro is something that if it gets screwy , there is almost no chance of recovery ESP for a beginner.
My strong recommendation, find a gp780 or 790 used or used like new from the forums.... If you can bargain and deal hunt like I can,

you'll find it in your right price range ..
