Welcome to TDC! Here you go...
Combined Arms Detachment
1 Archon in a dual cannon venom 125
2x 5 Kabalite Warriors in dual cannon venoms 210
2x 5 Scourges w/4 Haywire Blasters 240
3 Reavers 48
1x Ravager w/3 Dark Lances 125
It's not exceptional, but at 750 points it'll probably do fine. When possible, I'd try to get a Lhamean to replace that archon so you can put caltrops on the reavers and buy some other upgrades(This might be one of the few situations I'd suggest putting blasters on the warriors)
Good luck, and let us know how you do!