gosh, nobodys really talked about space wolves
im a bit biased but blood claws, troop choice, can field a 15 man squad with 3 power weapons, melta bombs and a special weapon. and they get +2 attacks on the charge with the berserk charge rule. they a bit cheaper then regular marines but have 1 less ws and bs.
then grey hunters, also troops, you must take at least one squad of these. they have bolter, ccw and true grit. can take 2 power weapons/fists and 2 plasma pistols.
wolf guard, can essentially be played as veterans or terminators and all have access to the armory.
i won't bother going into detail about the HQs except that 4 attacks come standard.
space wolves have access to some cool wargear. the ability to always hit on a 3+ in cc regardless of ws and a power weapon that adds +1 to strength
the only really annoying thing is mobility, either drop podding or lots of transports is the way to go here
its very satisfying to plow into an enemy squad with ragnar blackmane. "ill take my 7 attacks at str 5 hitting on 3+ now"