Hard to say what will happen 3-5 years from now for b-school admissions. However, you should shoot for 700+ on the GMAT (and probably to be safe, 740+ if you're looking out 3-5 years). Your GPA will likely be an issue at H/S/W, less so at any of the other top schools.
Beyond that, just go into this new phase of your life (working full-time) by making the most of it and avoiding the trap of sleepwalking through it (i.e. where your life becomes so routine that your life starts to flatline and days blend into one another...).
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