RE Spellpower: there is bug in how wowhead displays heirloom items (after obtaining the data from the wow-armory, i think) and it always shows massive amounts of spellpower. pretend it isn't there because it isn't.

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RE Daggers: I like daggers. I started out my rogue in Subtlety (with two points in remorseless attacks) because the stealth bonuses are handy, plus autocrit ambushes to start every fight are just sick. somewhere in the middle i switched over to combat, and it was fine (always having Slice and Dice for speed is great). At fifty, I switched to mutilate, and i don't regret it. I just like it more, that's all.

Whatever the "best" or "most recommended" spec is, you have to remember that you, the player, have to play it, and particularly for leveling you have to enjoy it. It doesn't matter if combat does more damage at level 50 if you don't enjoy it. If we're talking raids, then you ought to go with the best spec your weapons can support if you can play it well enough, but leveling is about doing what you enjoy most. That said, most folks prefer combat for leveling.

Same goes for hunters. Unless you're 70+, the best pet is the one you like to look at most.