Best 65W CPU for passive system

[Amp34]

I'm planning on building a second passive mITX system and want a CPU to put in it, as powerful as possible for photoshop and video work. My current one has a 77W 3570K but I've had to underclock it slightly to stop it overheating (just by 5%) and would prefer to not have to do that for the second one.

Haswell appears to have done great work for laptops but it appears the desktop versions are higher TDP than the Ivybride predecessors? What is the best 65W (max) processor with a good integrated GFX system?

 

[Amp34]

The S series is probably the best bet but are there any negatives to them, for example the 4670S and 4570S appear to be equivelent to the I5-3570K, any negatives? From what I can see they should be around the same processing power but better GFX power? Missing anything major?

Edit: the other option is always an AMD chip, however I have no knowledge of them, any that would compete with the the Intel S series CPUs?

 

[Amp34]

Ok, bit of a back story to answer a few questions and comments.

I currently run a passive system with a 3570K in a Streacom FC8 EVO passive case (heatsink style case). The second computer I'm looking at building will be very similar, either in the same case or a more HTPC passive mITX case.

With the current system at full speed and running P95 the case just isn't enough and it ends up with runaway temps and throttling so I've underclocked and undervolted the CPU by about 10%. That means it maxes out at around 90 degrees, not great but I don't envision running 4 instances of P95 regularly. Standard idle temps are around 40 so not an issue and I don't really play games on the machine (only occasionally want to do video processing). Streacom say you can put a 95W processor in but obviously not (the case is HOT to the touch so it's not an issue with heat transfer)...

With the new machine I was wondering about sticking a 65W CPU in from scratch rather than having to underclock a more powerful processor, hence the original question.*

I shall have a look into the AMD/Adobe suggestion and also the Kaveri tip. I was hoping Haswell would sort this out, however it looks like the new Haswell desktop chips actually have a higher TDP than the equivalent Ivybridge ones.

*I've had problems with the board underclocking and currently have problems with sleep mode, notably it doesn't come out of sleep properly and after 3 tries restarts to load. Not sure if this is a problem with the board, setup or due to the underclocking.