You can go two ways within a guardian; melee or heal, or even melee/heal!
Stats are dependant upon what you are doing, Heal : You can do all intelligence/or first half points into vit then rest int for higher life pool. Then you would basically need intelligence items or heal mastery items, and the highest heal charm you can get. If you are going melee you would need the highest ee club you can get with either a dex/high ee plate, and dex/str charm. Melee isn't the best route for this class though. Check out this guide fore more info :
http://forums.d2jsp.org/index.php?showtopic=19782009&f=272