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Now i'm moving back to Chaos, in the coming weeks i want to start using Abaddon again. He's my favourite 40k Character, and was quite common in my old lists, and although i didn't do too badly with them, but when i was playing Chaos, the environment didn't seem as competitive as it is now. (Plus i may or may not want to use him at Tournaments.)

As far as i can really work out, there are two main options (with a bit of room for variety)
The first one, and i believe used to be quite popular:
2x Land Raiders one with Abaddon and Zerkers, one with Kharn and Zerkers. With maybe a squad of Oblits, and if it fits in some Plagues in Rhinos (roughly can fit Abaddon, Kharn, 2x8 Zerkers with Power fist, 2x5 Plagues in Rhinos with 2 meltas, 2 Daemonic Possession Land Raiders with 74 points left over, could maybe just have one squad of Plagues and 3 Obliterators)

This is obviously a very risky tactic, and i'm not sure i would want to go for this, as i already have a duel Land Raider C:SM list with TH/SS termies.

Second:
Abaddon in Land Raider with Terminators/Zerkers/Plagues with a mech support.
So this option, would only have one Land Raider and preferably 3 Rhino squads?

Is there is better way to utilise Abaddons killing power?

Not really. You pretty much have to deliver him with a LR. There's a bit of a gimmick list with him just footslogging across the field in a big unit of Plague Marines, but it's gimmicky, as said.

Lots of discussion about Abby in this recent thread:

http://www.dakkadakka.com/dakkaforum/posts/list/362954.page