Why do you think crossbows go well with 2H? I wasn't specifically planning anything concerning that. In fact, I'd like to use the crossbows in Dawnguard, but so far the only character I have planned for it doesn't use Archery. And what's wrong with the 5/5 skills? After some anolysis, I know when to best utilize them. For instance, I wouldn't use 5/5 Shield Wall with a shield or 5/5 Juggernaut with Smithing.
My gripe with the 5/5 skills, is they are just straight boosts, and the effect can be duplicated via alchemy or with enchanted gear. They don't give your character new "abilities" per-say but more just a flat effectiveness increase. I look at those perks as tree unlockers myself- so that you can get an ability higher up.
I.E. Ranger perk = ability... archery damage 5/5 perk = just more damage.
my crossbow comment is because you could always flip to a crossbow to fire off quickshots before switching to 2H and going melee. The first crossbow shot will be quicker than anything a bow can do. Think about this: a cocked and ready crossbow with a paralysis poisoned bolt: useful? yes...

my recommendation: (with your RPing your training in alteration as combat focusing) (since you can pay for this training and take the resist perks)
http://skyrimcalculator.com/#138067
to 50. (also I am assuming you are using blades- swap the crit perk to whatever if you aren't)