I've used the Dr Brown's from day one of bottle feeding and never had a gas problem. I love the venting system, I think it really made a difference... that said, I didn't try other, non-vented bottles. But at 17 months, she's never had an ear infection either, which I've heard was a big deal with kids and bottles (the negative pressure?)
We bought some on ebay, new, for a better price than in the store but I'm sure you can get them on a sale/with coupons, etc. to off set the price too. I used to handwash the bottles and venting parts, now I just put them all in the dishwasher and my life is easier!
You could also call up a lactation consultant and ask them about the nipple collapsing issue, they might have suggestions for flow or if one nipple is better for a strong/breastfed sucker than another. My babe wasn't a strong sucker at first so the Dr Brown's were fine for her.
Good luck!