I second Beth H's answer completely. To add to her response, some of the issues the baby may have won't have anything to do with weight, but the baby's weight will be the most significant predictor of health outcome. I would deliver at Abbott Northwestern or UMMC-Fairview.
When I was pregnant with my twins, 32 weeks was always a possibility, and my OB said that if I went into labor or started having problems before then to just head over to Abbott. I hear their NICU dept is very, very good, and I'm sure your doc knows that, too. I ended up being induced at 37 weeks, but my twins fit the profile of 34 week babies and sufferred many of the same issues (bigger issues with the 4 lbs 4 oz son than the 5 lb 8.5 oz son). They were in "special care" for 4 weeks, but now are physically healthy as can be.
Good luck. I know it's nerve-wracking and I vividly remember those days. Trust in your doctors and nurses, it will help you feel better, and check out some books on raising a premie. I don't remember which one I borrowed, but I recall just having something to read about caring for premies was very, very helpful and made me feel less alone.
**Also, I strongly suggests finding friends and/or family who will help with watching your older son when baby 2 is born. The parents with older kids to watch were in the "special care" unit a lot less, and it just seemed like the baby in special care took longer to recover without the parents around. Just my impression, I wasn't looking at charts or anything....