The man who would be mega.

Wow dude congrats. :D
The third one looks pretty cool.

Congrats! I'd say second. The first would be my second choice.

First off, let me tell you that you have the greatest username ever.

Second, I suggest going with the third one. Bass Cross is so effing awesome.

I'd say the second one, it would look nice as a avatar as it's a good size and has a background.

I say second as well... it is a good size and wouldn't have to go through a ton of compressing, so it'd still be clear what the picture is. And, yeah, it has a background like Croag said!

Chaos Napalm Soul Megaman!

Second, has a background

I like the second one.

I like the second best. BTW, congrats! :D