At your gearlevel I would gem intellect, mp5 and SP. Forget about haste, it's only better at higher gearlevels, and it doesn't help your mana problems at all.
1. Get the Owl JC trinket, it has a useful mana gain use.
2. For dungeons, I would probably go with LHW glyph over Riptide, simply because pulls don't last long enough for the extra 6 seconds to be that useful, where 20% on your main heal is awesome.
3. Pick up Talisman (vosts 50 trimph badges) and Tears of the Vanquished (drop from ToC 5 normal). If you get these trinkets, you can skip the JC one.
4. Right now focus on mp5 and crit pieces, both crit and mp5 gives you mana. Mp5 is more important though. Once your gear improves to full 232 and 245 gear, go for haste pieces. It doesn't really matter if they have haste+mp5 or haste+crit, as long as they have haste. At this gearlever I suggest going for haste gems aswell. Remember tht you can put 10haste 5mp5 gems aswell if you still have some trouble with mana.