I LOVE STEEL PLATE (and so do town guards it seems)
The only slightly 40-80 extra defence with dragon bone armour. I have 100 smithing (no magic enchantments or fancy smithing juice for me) and 4 items that improve smithing by a total of about 30-40%
my heavy armour rating is about 60-70 and I have 3 perks in the skill +60% rating of heavy armour... and the perk an extra 20% if wearing all heavy armour...
lvl is 34 on this guy... difficulty expert.
Steel plate body alone (legendary) is around 140
Dragon bone alone (legendary) is around 160
ebony and geydric are better but most say (and il agree) can make the game very easy when improved with smithing (or without apparently)
So yes, I've been using steel plate and its still "ahh now that's some fine armour, good old fashioned steel plate" - whiterun guard

and It is good enough... even against tougher dragons... the priests and many other boss like enemies even on harder modes...
Dragon bone works slightly better but it doesn't make a big difference... ebony is likely better and then geydric comes after that... oh I mean daedric ofcourse =D
but yes get yourself 60 smithing and you can make PLATE armours... get some steel plate and you can fight like a knight! without all the magic fantasy armours =] if thats your taste

it is mine when im not feeling silly xD
Current loadout
Lydia = full steel plate - legendary - with skyforge steel greatsword = not stealing my kills and takes aggro away without dying "too" fast
Me = Full steel plate - legendary - with skyforge steel sword and a steel shield (legendary)
Never have a problem... once I got block perks up and chose the perk that "reduces fire, ice & shock damage by 50% while blocking" ... you are a dragon/mage/bandit slaying steel plate wearing beast =] you won't feel rediculous, and you won't feel weak either... nice medium... Maybe Il be upping the difficulty soon because the lvl 40 barrier things start getting easier again... =]
Note Edit:- 100 smithing and no extra smith boosting stuff is still good enough in my opinion... or if you want better but dont want to enchant... keep an eye out for body-necklace-gloves-rings that increase smithing... blacksmiths and general stores sell them for a high price - well worth it when you can spend 100 on a corrundom ingot and improve a steel plate worth 600+ to 1200

now thats simple low-mid lvl profit
