My thoughts--
1. Without KP, you will have significantly less TAs, espeically in games that actually matter (i.e. vs non-awful teams that actually attack you and not let you free-cast). KP is still a good amount of healing on the target, and helps your own survivability well.
2. If you don't have energy managment issues, you are likely either on a team that is very healer heavy, or your opponent is DPS-lite, undergeared, or bad. Talented DS is necessary, imho, for PvP that matters.
3. RN is very strong now in 1.2. It doesn't have the raw healing of the Sorc AoE, but you don't have to stand in one spot to cast it or get the benefit of it. It will help you and your team surivive for sure.
4. The changes in TA from 1.2 has moved me from someone that never used and hated Infusion, to someone that uses it all the time. Any time I'm at 3 TA and the target it taking real damage (ie, SP isn't going to help much), I'll cast the 1.3 second Infusion that will crit for 4300-5k, and save 5 energy.