The Antec Solo is a decent case for a quiet build. Only changed mine when I found my graphics card upgrade to a GTX260 was too long to install.
http://www.morecomputers.co.uk/extra...761345-08500-7
The panels are a dual layer construction with a thick plastic laminated on the inside and the drives are suspended between elastic cords.
If you intend to rip and compress video to AVI then a quad is essential. Having said that this last year we have been seeing a shift towards video compression (trans-coding) being done faster by graphics cards. This is because the GPU on a modern graphics card has more cores than a CPU and the compression is an ideal workload for parallel processing on multiple cores.
One example of GPU video trans-coding software is Badaboom which I believe runs on Nvidia hardware.
http://www.badaboomit.com/