I have Kaplan
GMAT 2003, OG, GMAT Plus tests,ARCO GMAT CAT,Some Downloads of practice qns for Verbal and Quant.
In other words, more than enough.
Here is what I would do and here is my logic to it.
(you may also read this post: http://www.gmatclub.com/phpbb/viewtopic.php?t=77
and there is another one on OG, but I could not find it
In any case, I would start with Kaplan
and jump on the strategy as much as I could. Take specific Practice Tests, not GMAT's. Then practice more with wither workbooks or specific practice exams.
In a few weeks I would start taking GMAT's
Try to see how the timing goes, how the gut feelings goes, and how the mistakes are going.
At the same time, I'd start working on the OG - concentrating on the verbal part. After a week (in week 3) I'd take a PowerPrep test and see how the things are doing.
Then, re-evaluate it and do some last day intense concentrated prep, take another PP test and possibly others.
Here is a link to Gmattutor's sugestions: http://www.gmattutor.com/gameplan.html
P.S. I would not bother with ARCO, Barrons, or such. PR is somewhat helpful, but I would concentrate on Kaplan