Trust me. The ML110 G6 is virtually silent. The loudest thing in the machine is the WD 250Gb RE3 !!!
At startup its full bore fans for a few secs, but this can be turned off in the BIOS under "blow out feature". Perhaps this option was to blow out dust every time the server was hard rebooted. Quite clever really.
However with this turned off, the server slips stealthily on, and if you had a quieter hard drive (I think they now ship with Seagates, so perhaps) then you would be sorted.
I have three in my living room, and when they are all on the noise is there obviously with three machines, but its barely noticeable and definitely not anoyying.
The G7 has extra fans, but the G6 has one CPU fan, and one exhaust fan, and both run at low speed, unless ur in the Mohave Desert or somewhere!
I cant stand noise, but have no complaints at all about the ML110.
Ive beefed mine up with Quad Nics, and some P410 512MB RAID cards.
With some clever PCI-e arrangement, you can get the full bandwidth from the cards too.
I also believe there is a cashback offer on the G6 too.
In addition, the G6 has an ILO and you can do remote KVM via your browser and mount ISO's as boot discs etc. Its very cool, but its an ILO100 Advanced feature you normally pay for. However, I have some spare licences I might be able to let go for free.