What's the most suitable build for me?

Well, what you could do is stat for LA for now (since HA is kind of hard to build on at your level), and then hybrid HA/AA later, for situational pvp. This build WILL nerf your magic damage a lot more than a mage build veno of course, but you'll always have amp damage and purge on your side for squad support later, and in pvp will be able to have the flexibility of using switching between armor sets based on who's attacking you.

Although, since you're already 65 and you didn't mention your current build, it might be better to forget the LA and just stat for HA/AA later.

I'm not exactly sure when the LA veno build becomes obsolete, as my partner's LA veno (which he adores because he's an archer at heart) is only lvl48 right now, and my own LA character is only 64. I believe it's around 85, since I hear LA refines poorly past then. I've also met an HA veno in her 80's who's done moderately well tanking in both mage form and fox form.

b:chuckle I'm sure someone who knows more about veno pvp will come in and say more useful things, like stat numbers and helpful gear information. I'm not very helpful in my mid-morning stupor.

b:lipcurl In theory you can go aps with a decent crit rate and not completely nerf your mag so i'm not sure that LA does become obsolete past a certain point. This is one of those can of worm subjects so I'm basically sticking to only mention this in passing...