Arch/MM/MM
For wider defense coverage I suggest building your positional defenses to 32.5% with the Agility Core Paragon. This will allow you to keep hasten and Drain Psyche perma, your s/l resistance at 50% and your energy resistance at 30-33%. I don't have time to look at your build right now but I definitely don't recommend building more than 2 types to the softcap since Arch/Ment benefits so much from global recharge. Either just softcap s/l or hit 32.5% to positions. The latter would mean you're softcapped to everything with a small purple.
After playing for nearly 6 years I still have yet to find a blaster I want to level. I did make one (an Arch/EM/Mu) that I leveled 2 years ago but he quickly was shelved. Looking at the build below I think it is time to yet again attempt to make a blaster and see if I enjoy him. I have most of the IO's stored in my SG base (EC's helped to fill 8 or so enhancement bins) but I was just wondering opinions.
I had to drop hasten to reach softcap on S/L/E/R and I know I will lose some of that defense once I attack with Stealth cut in half but just wondering what all of you think?