I should be able to help here,i have a full quiver of 2011 Chimera,6.5,8,10.5 and 13,
have spent the last few months on these kites and the 011 argo's in 10,11.5 and 13.5.
The two kites are totally different ,the argo is a great allrounder but more for the surf rider super stable and bucketloads of grunt,the Chimera is also a great allrounder and is quicker in the loops,more of an atv kite ,both kites have awesome boost and float,if your looking for a low end grunter then the 13.5 argo is the pick,but if i compared the 13 Chimera with the 12 griff the chimera wins hands down in any category,get a demo if you can ,love these kites.