GMAT Strategy

So, I've decided that its been two years of being lazy (defined as just work) and it's back to hitting the books to prep for the GMAT... I've been reading the blog a bit and would really love some opinions on whether or not this strategy seem feasible or whether it's just better to take a course and get it over and done with... I'm truly indifferent as to the method but I am somewhat of an overachieving do-it-yourselfer and would love to bust my a$$ and know I did well due to pure drive not a course (sounds whacky until you hear my actual study schedule)...

So I recently invested some time into tackling this obstacle and for the past week I've been waking up at 5:30 to study 1-1.5 hrs before work and then 1-1.5hrs after work ( i work late hours so a 2hr+ study sched after 10pm is a little difficult), wknds 3-4hrs a day...

I'm currently on the Gmat premier book to get a general sense of the test and some basic skill, and plan on taking the gmatprep exam once I wrap it up this wknd for a general idea of what my score is... After that I'm thinking of the following:
- Review all the MGMAT books for the Math Section;
- Complete the Quantitative OGMAT book
- Powerscore CR
- MGMAT SC & Doing Grammar by morenberg for a touch up on english
- MGMAT RC
- Complete Verbal OGMAT Book
- Go through the OGMAT 12 book...
- take the 5 kaplan CAT test from GMAT premier
and then I run out of practice ideas... mgmat have anything online?

overall is this feasible for a 700+ score or would a course be better? if this seems good, any other problems sets I could tackle?

btw, im thinking 3-4 months for the whole process...