650 "All comer"

First of all 650 points is what I can scrape my collection to so that has been set as the limit which is why its an odd limit and also I am rather restricted to what equipment I can include as I ALWAYS play a strict WYSIWYG format regardless of venues ect.

HQ
Inquisitor with Servo Skull (28)

Elites
9 Warrior Acolytes, 7 Bolt Guns 3 Melta Guns in Rhino (112)

Troops
5 GKSS, Psycannon, Daemon Hammer in Razorback with Psybolt Ammo (170)
5 GKSS, Psycannon, Daemon Hammer in Razorback with Psybolt Ammo (170)

Heavy Support
5 Purgators, 4 Incinerators in Razorback with Psybolt Ammo (150)

Total of 630

I have 20 points to give to my HQ and have no idea what to give him

So I'll be facing Imperial Guard and Dark Elder and obviously I'm going to be outnumbered and I am expecting to be out manouvered (DE) and to take a large amount of shooting.

I am looking for advise on what I can expect from a DE player at this points level and whether the models that I own will be enough to put up a good fight. I know about pain tokens but that's his bonus not mine

Also is the three Melta guns a good choice for the Warrior Acolyte squad or should I include flamers/plasma guns or combi weapons? - I have a large collection of Necromunda Miniatures (House Escher, Cawdor and Redemptionist Gangs) that I am going to use as my Henchmen for the time being or permantly if they paint nicely.

Many thanks for your help.

My DE opponent is running the following

HQ
Haemonculus, mind phase gauntlet & liquifier gun

Elites
4 x Incubi

Troops
10 x Warriors, Splinter Cannon

5 x Wracks, liquifier gun

Heavy Support
Razorwing Jet Fighter

Transports
2 x Venoms
1 x Raider, Disintegrator Cannon, Splinter Racks, Night Shield