Well considering a lvl 48's Int cap is around ~348. Your INT is incredibly low. I had a ~220 int unbuffed at 48, I just recently upgraded my Int gear to whatever is in my sig, buffed I can get it up to 350ish. My power is around 3500 (also in my sig).
You definatly need to upgrade your armor for Int gear. Most of my stuff until I hit 50 was all Legendary or less, mainly drops from mobs and quests.