I've got a bridge that I can sell you...
Seriously though, when ever I think of "investing" I think of what Will Rogers said... I am not so interested in the return on my investment as in the return of my investment.
Why IBM? And what is your investment time frame. If you can't hold it for at least several years, I'd be leary of any stock. And what are you going to do if it drops 10% after you buy it... and then another 10%... etc. From personal experience, it's a lot easier to get in than to get out.
Anyway, good luck!