Hey there! While I personally reason that 1500 is not worth playing at, as there simply aren't enough units to play with, regardless of codex, it looks as if you have a good basis to go from.
Now, I checked the numbers right quick, and if you drop the PM squads to 5 man, drop the pfist champ (really not worth 40 pts), and get rid of the termicide squad, you will be able to put in a third choice of 3 Obliterators, or even squeeze in Kharn by switching him with the DP. The safety of the Rhinos with EA, coupled with one Lash, the insane assault ability of Kharn and a good squad of Zerks, then augmented with Oblits, will do quite well for this points level.
Have you considered Chaos Dreads? Their EA and Multi-Melta combination is quite successful.