That's a good list with a suitably good (and simple) battle plan.
My only, albeit very slight, qualms are that all Land-Raiders should pretty much always have extra armour. ALWAYS!
Also, the runic armour isn't really needed on the Priest and Wolf Tail Talisman definitely isn't needed. Terminator armour or neither could do it just as well. Infact, you may find for your needs that a Rune Priest (or two!) would work better as they can sit back and zap the enemy with their unlimited range living lightning before the enemy closes the distance.
Also, you may want for more armour than 2 land raiders and 2 razorbacks, you could find swapping the typhoon and long fangs for 2 autocannon/las-sponson predators could work better.
This is where my only real suggestion comes in; drop the Land Speeder. I can see your reason for including it, I really can, but it doesn't really add anything to the list and the points could be better spent elsewhere. For example, you could drop the Land Speeder and have enough points for:
- A Rune Priest, reasons outlined about
- A
CML Wolf Guard for the fangs, equal firepower to the land speeder but helps protect the long fangs and
KP's
- Extra Armour for the Land Raiders, you want your 500pts to be able to move and shoot.
- Another Razorback for extra firepower, transportation and armour saturation.
- Wolf Standards/
MotW to help with counter assault when the enemy reaches you.
- Smaller Long Fang Squad - Extra firepower =
You could even make a mix of the above suggestions but I really would advise dropping the Land Speeder. Otherwise it's a good list.
Hope I could help, Dave.