Well be careful of PR and MGMAT. you rightly said verbal is infalted PR scores and same is the case for MGMAT. I got 720 in PR couple of days back before my actual exam and you know where I landed in actual gmat..( well yeah there were other reasons...no sleep..pressure..) . But still on verbal side , I dont believe these tests anymore.
I agree w/ MGMAT as well. I got a 780 on the last test I took from them... no way I can get a 780. I must admit I did use the pause for some of the math questions, but finished the verbal with around 15minutes to spare.
I feel their verbal is too easy and the SC's in particular are too much like MGMAT's SC
book. In reality GMATPrep's and the real GMAT's SC's are MUCH harder.