I've found Riggers are more valuable (and less points) than Plates.
I'm assuming since you listed a small number of nob bikers you're not planning on letting them provide cover for your foot-sloggers, so why the
SAG? I love it, just my style of play I try to take 2; but for foot sloggers you need the
KFF and it doesn't change your costs much.
From your list, it seems you have a lot of
AOBR boyz?

Always a good choice. Price wise (maybe prohibitive), thought about taking two more Battle Wagons? I like the Gun Wagon myself, but rokkits are cool. Deffrolla costs a lot, but is effective vs. Troops. I'm assuming your 20 man unit is going in the Wagon.
So in reshaping your list (if I may):
HQ - Warboss, Bike, Cybork, Squig
HQ - Mek w/
KFF (put him in the trukk behind the Wagons)
Troops - Slugga Boys (20), Nob w/
PK, Pole (Wagon)
Troops - Slugga Boys (20), Nob w/
PK, Pole (Wagon)
Troops - Slugga Boys (20), Nob w/
PK, Pole (Wagon)
Troops - "Ard Boyz (10), Nob w/
PK, Pole - Trukk
Troops - Nobs (4), Cybork, Painboy, Bikers
Elites - Lootas (9)
Elites - Lootas (9)
Heavy - Rokkit Wagon
Heavy - Rokkit Wagon
Heavy - Rokkit Wagon
I don't have my codex in front of me
atm, but I'm pretty sure this is still close to your original points total.