Here, one thread full of scans of various types of discs with the 4167B :
Note that this drive does not like TYG01, but that's about the only problematic MID with it.
I think both drives are about equal in terms of burn quality. Do remember though, that the 4167B review was done with a previous version of firmware (DL12). DL13, a newer version of firmware, has been around for a while and has had an impact on burn quality. Compare that to the fact that the 111 review was just recently completed so it probably has about the latest firmware for that drive.
As already pointed out, the 111 doesn't do bitsetting/booktyping whereas the 4167B does. However, you don't really plan to burn +R discs so it may not be that big of a deal to you. 4167B generally burns most 16x discs at full 16x whereas the 111 burns quite a lot of 16x discs at 12x. That really isn't an issue to you either since you are mostly concentrating on burning at 8x. Still, it is useful if at any point you cannot get hold of 8x media and are stuck with only 16x.
I think it comes down to which is quiter in your case.
I can't comment on the BenQ DW 1650. I only have the 1640.