Battery power?

Most of my operating is QRP, mostly 2.5W and occasionally 5W. On 472kHz my transverter produces 12W for an ERP of 10mW. Although I currently use an old linear PSU, perhaps I should use a battery pack with a charger to use when the pack is not connected to the rigs. Mains borne noise is likely to be less of a problem. I'd be interested to hear your views.

Analogue or switch mode PSUs?

Although I have a linear PSU, I am thinking of getting a new PSU  to complement the one I have. Although I mostly use QRP, it would be good to get one that will power a modern 100W rig. I think this means one that can run 25A without overload.

SMPSUs tend to be smaller, but can be noisy both electrically and because they tend to have fans. Linear PSUs tend to be larger, but often don't have fans.

Any recommendations?

At the moment W&S are offering a special deal on a linear PSU with a 2 year warranty.