Reserve everything, even the lootas and such (yes this might result in them not getting to shoot for awhile but at least you won't be giving away their KP).
If he's smart, he'll drop pod mid-field just out of range of you being able to assault off the table edge. If not, you should be able to land a few assaults (although space wolves don't really care but at least you get another attack).
I would recommend throwing in a unit of nob bikers (they'll be a troop choice as you have a warboss). Giving the warboss a bike (now you have a great hammer unit that's scoring). I would look at maybe dropping a few things like the grotz, big guns (I realize grots are a cheap way to score but they do nothing else), and reducing the boy squads to 20 man. With the saved points you could probably afford battlewagons /w deff rollas for the 20 boy squads. Gives you a mobile shooting platform that can munch on armour or cause damaging tank shocks.
Lately I've been playing this list at tourneys (I'm also taking it to the Astronomi-CON in Vancouver this year).
HQ:
Warboss - Attack Squig, Power Klaw, Cybork Body, Warbike
Ghazghkull Thrakka
Troop:
4 Nob Bikers - 1 Power Klaw, 1 Power Klaw & Bosspole, 1 Waagh! Banner & Big Choppa, 1 Painboy. (Warboss goes here)
3 Meganobz - 1 Kombi-Rokkit, 1 kombi-Scorcha
-Battlewagon /w deff rolla, big shoota, red paint job
20 shoota boyz - 2 big shootas, 1 nob /w power klaw and bosspole
20 shoota boyz - 2 big shootas, 1 nob /w power klaw and bosspole
Heavy:
Battlewagon /w big shoota, deff rolla, red paint job
Battlewagon /w big shoota, deff rolla, red paint job
Ghaz joins the meganobz, warboss the nob bikers. 2 shoota squads in the heavy battlewagons. Has 4 troop choices and absolutely everything in the list is able to shoot on the move. Deff Rollas to deal with MC and land raiders.
This army can reserve everything and just roll off the table edge, deff rolling and shooting everything before it charges into combat.
I realize Ghaz is pricey, especially for 1500 points but with so many jacked up characters around now - you need something to use for assassination. I have yet to find anything that lives during the time he Waaaghs! Even then he usually lasts longer than just that turn. Meganobz are purely a fun choice for me and could probably be replaced by more nob bikers.
Its a tough, fast list with everything either being T5 or in 14 armour putting out over 100 shots a turn and everything being to handle itself in CC. Lots of str 10 and str 8.