My son pulled a third AIM Agent the other day so I started looking for an anchor for a 300 point AIM team, after adding up his generic AIM figures and then checking up on the keyword I came up with this...

AIMarine (with Hulk AE) - 50 pts
AIM Agent - 38 pts
AIM Agent - 38 pts
AIM Agent - 38 pts
AIM Renegade - 34 pts
FIXER -102 pts

TOTAL = 300pts

Any suggestions for tactics?

I think you are a bit light on attacking power there, actually. You mostly have support figures and would struggle against a competitive team. May I suggest something like this?
CA Klaw 127
Batroc the Leaper 52
AIM Agent 38
AIM Agent 38
AIM Agent 38
That's 293 points, so you could fit in an object as well if you want - Klaw with the Scorpio key could be interesting...

Cheers, I'll give that some consideration.

Are there any other good characters I could add with the AIM keword?

I'm assuming you don't have MODOK since I can't believe you WOULDN'T achor an aim team with him

Other figs that are good achors for AIM teams are CA Red Skull (either version) or CA Klaw (either version). Another really sneaky good combo is playing Fixer and Mentallo together with the yellow lantern (with a perplex on each one, they could both have a 12 )

Fixer
Mentallo
AIM Agent x3
Yellow Lantern
=292

Correct

Got the 100pt Klaw and Red Skull but not the higher point dials and no Mentallo (YET )

Definitely pick up a Mentallo if you plan on playing A.I.M. The combo of him and Fixer is just too good.

As far as tactics, no matter which version of the team you play I've found it best to let the opponent come to you and not press the attack (I play A.I.M. a lot). These guys should really be playing bunched together.

52 - ca028 Batroc
76 - 2Xih003 A.I.M. Agent
34 - ih017 A.I.M. Renegade
60 - ca210 Klaw
60 - ca019 Yelena Belova

leaves 18 points ...

Hmmm, I'll have to rethink this ..

127 - ca029 Klaw
52 - ca028 Batroc
76 - 2Xih003 A.I.M. Agent
34 - ih017 A.I.M. Renegade

That's 289, so you can add an object.

The 1st team has three attackers, the second one has two attacker.