BSchoolinAUS
MartyTargetTestPrep
Regarding TTP RC, it should be out around the end of July.
So, you're going to be able to use the TTP course for all of GMAT verbal. In fact, I'd like to see you join the TTP V51 Club.
Oh that's great news. At this point will verbal exit beta, or is there more to be added?
While I have you, I was hoping to get your opinion. Is 750 a realistic goal coming from my current no-prep 650 score? I plan to study 3 to 4 months mostly with ttp but can supplement after if needed. I will work hard but I also don't want to have an unrealistic goal.
Once RC is added, TTP Verbal will exit beta mode, and the truth is that people have already been using TTP Verbal to achieve stellar GMAT verbal scores, partly because the CR portion covers much of what's needed to ace RC.
Regarding seeking to get from 650 to 750 with three to four months of fairly intense preparation, yes, that is realistic.
To get primed to knock GMAT verbal out of the park, you could read this post, if you haven't already.
How to Score High on GMAT Verbal