Which case are you considering? I ask because if yours is a typical HTPC using onboard graphics, the real power demand will be well under 100W, typically 50W or less. This is true for the several such HTPCs I've built over the years. This means, depending on the case, you could easily run a hgih efficiency PSU fanlessly -- or at least with the fan running so slow as to be inaudible. Might require a bit of modding, but nothing too onerous, mostly just swapping out a fan in the PSU.
I'm considering building two small form factor silent PCs:
1. HTPC (Ivy Bridge 35/45W CPU, Blu-ray player, 8 GB RAM, 80 GB SSD). I'm considering one of the HDPLEX cases. I'm still deciding whether it's ok that it lacks some "features" I'd like possibly to have, for example space for a front LCD panel, front USB connector (only some HDPLEX cases have that), and a PCIe TV-tuner-card (e.g. using a raiser card). Also, I don't know if all HDPLEX cases have fixtures for a Power Brick. Looking at the pics at their website it's somewhat unclear?
2. Desktop PC (Ivy Bridge 3570/3770K, Blu-ray R/W drive, 3.5" front multi-card reader, 16 GB RAM, 240 GB SSD): I'm considering for example the Spire SPM210B (see http://www.spire-corp.com/main/product_ ... ProdID=826
). It has space for a SFX PSU. If I can find an even smaller case while still keeping the computer silent, then even better of course.
However the Pico PSU requires an external PowerBrick as well, which I don't want to have
I'm curious, why don't you wanna use a brick? You will need a power cord either way - does it matter if there's a lump on it?
I don't like to have external stuff "lying around" outside the computer case. For example I don't like to have external hard drives, external TV-tuner-cards, external card-readers, and so on. It's messy. Everything should be kept inside the computer case as far as possible. Tidy and clean.
So to summarize, I have nothing against using a PicoPSU + PowerBrick. But I want it to fit in the computer case without any home made modifications to the case. And the back of the case should only expose a standard 110/220V power coord connector (+ power on/off switch) like normal computer cases do. So either the computer case must have fixtures for a PowerBrick + Pico PSU as some of the HDPLEX cases seem to have, or I need to find a SFX PSU that is fanless (or contains a Pico PSU + Power Brick