I've got both the BQE (picked up for $60 on a special from mwave!) and the V1000. I would assume the V1100 is more quiet than the V1000, but here's my experience so far.
The assumption that steel is much more quiet than aluminum definitely holds true, and while the V1000 is indeed an awesome case, it isn't necessarily well suited for silencing. Lian-li did a great job with designing the case, but I believe it's a given that it would be much harder to silence than a steel case, since its so sensitive.
Minor nuances in the V1000 make things tough such as:
- vibration from HDs is tough to cope w/ due to the unique mounting. There isn't much room for drive silencing options, although there's a post here
on drive suspension.
- Cutting out the rear fan grill is definitely a must.
- Since everything is compartmentalized, your options for good airflow design are hindered (i.e. HD/PSU ventilation is isolated from the rest of the case).
- For me, the case runs as a giant heatsink since i run my box pretty hot, and the aluminum transfers heat pretty to the outside pretty well. In tandem with the heat ventilated from the holes in the case, this raises the ambient room temperature in my room.
- Definitely consider undervolting the stock ADDA 120mms. Although they're not bad, if you're really hardcore, you might wanna replace AND undervolt them.
Of course, the BQE isn't perfect, but it's much easier to make quiet cheaper; you've got more 'leeway' to work with as far as sound is concerned.
In the end, it's really up to you on how much you'd like to spend overall. In addition to the higher initial cost of the V1000, you can count on spending more on peripheral components such as a good PSU, fans, a quiet HD, and perhaps a good fan controller like the t-balancer.