I also supplement with Vitamin D, but only a bit of Vitamin E. I think it is 400 IU's, but I wouldn't go too high. I just dug up the article I read:
STUDY SHOWS HIGH-DOSE VITAMIN E SUPPLEMENTS MAY INCREASE RISK OF DYING that talks about high levels of Vitamin E.
Also in that page, there is "Current United States dietary guidelines do not recommend vitamin E supplementation; however, the guidelines do set an upper tolerable intake limit of up to 1,500 IU per day."
I really wouldn't worry about losing you to Vitamin E overdosing, but I found that to be interesting.
A better read perhaps is this article here:
Vitamin E's Lack Of Heart Benefit Linked To Dosage
With the key point being
"They found that it was necessary to give at least 1600 IU per day to cause a significant reduction in oxidative stress -- twice that used in some of the previous clinical trials.
"It was clear that large doses -- and doses in excess of what all clinical studies had used -- were necessary," Morrow said.
"Even with this massive dose of vitamin E, you only observe a 50 percent reduction in F2- isoprostanes," added Roberts. "So in my opinion, vitamin E is not the spiffy antioxidant everybody thinks it is -- it's a pretty poor antioxidant."
Hope that helps jjohn. So 2000 IU's wouldn't be a bad start, but you might want to consider other Antioxidants . I don't know what you're taking otherwise, but good luck with it