If you were asking me, I take the brand name Keppra. Epileptics sometimes talk about the generic being less effective, but i dno. 1000 mg is a fairly low dose. For epilepsy the dosage is 1000-3000 mg. If its not too wearing you could get up to atleast 1500 and stay there.
ramblington: Great sign that you seem to tolerate it and have noticed some improvements already. Still, dont rush it. When I started Keppra i had significant effects for the first couple of days when increasing the dose. Then the improvements almost dissapeared for a few weeks before slowly returning and stabilizing over several months.
Regarding B6, I actually lost some of Keppras effectiveness when taking it. Probably due to increase in serotonin levels.