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Kharn

5 Zerkers w/PF in Rhino
5 Zerkers w/PW in Rhino

5 Raptors w/2xMG

Oblit

I've got some points left over, where could I use the upgrades? combi-melta rhino?

A good start list

take out the oblit and beef up the other zerks

any eft over points buy another rhino for kharn since I find he is a bullet magnet so putting him in a tank with your troops will not pay of

I'm not a huge fan of Raptors, especially now that they're Finecast (and break all the freaking time). You're really looking at a 120 point suicide squad.
Add Combi-Melta's to your Rhinos. They're gonna be rushing forwards anyways.
I personally use a Lord with MoK and DLC in place of Kharn. Effective and slightly cheaper with no chance of killing allies.
Don't drop the Oblit, he's your only long-range anti-Tank. Although maybe switch him for a Predator with Lascannon sponsons if you can find the points. Unless you wanna keep a Khornate feel, then I suggest a Defiler.