Water blast/Mental Manip IO build question

Hi,

I'm nearing lvl 50 with my WB/MM blaster and need to figure out the best strategy for his IO build, which also will determine my last power picks. I want to make him more survivable overall but also capable of farming. I understand that using IO sets to build additional defense is key, however I'm not sure which TYPE of defense to build for? Can anyone help?

I'm not using MIDs right now (haven't used it in a long, long time), and just looking at the numbers using paragonwiki, but from what I've been able to calculate, here would be my numbers:

With Combat jumping and stealth I have about a base 5% defense toward all. Frozen Armor gives me an additional 16% defense toward smashing/lethal only.

Looking at the IOs and adding their set bonuses together I get this from them depending on what type of defense I build for:

Melee defense: 26.26% IOs + 5% base = 31.26% total defense toward Melee
Ranged defense: 16.88% IOs + 5% base = 21.88% total defense toward Ranged
Smashing defense: 15% IOs + 16% Frozen Armor +5% base = 36% total defense toward Smashing

My current build doesn't have Weave or Maneuvers, but I can probably add one of them in. This also does not consider the 2 Unique global defense IOs. Even so, you can see from the numbers above that it seems a lot easier for me to build for Smashing defense... but I wonder if that's the best way to go?

Thanks.