Blood seems better now with the addition of death siphon and unholy blight (at least in pve...haven't tried pvp yet).
Didn't think frost would do well in pvp, but actually worked pretty well with similar setup to previous commenter (synergy is awkward though). I took plague leech because unholy blight in frost seems like a wasted talent. Also don't recommend wasting a major glyph on anti-magic shell and picking useful minor glyphs instead of those he used. Use glyphed icy touch instead of howling blast.