[Radek]

Keep the Ring of Gaxx. You cannot find a better ring in the game. Sell the Ring of Acuity and the Ring of Wizardy - their bonuses are rather unessential because, as a soloist, a few low level spells cannot improve you. Later on (or already?) you will find another good rings: Ring of Protection +2, Ring of Free Action and so on. Keep them and use them according current circumstances.