Next step: tube pre or tube power amp?


I own a Rotel pre/pro RSP-985 SS preamp and a matching Rotel 120 watt power amp. If I wanted to move into tubes, would I get better mileage out of a tube pre or tube power amp?

I love the convenience of the rotel preamp (remote, built in DACS etc) but I understand that a tube pre will have more impact than just a tube power amp. Is this correct?

Also, my speakers are 91db efficient. What wattage tube power amp would I need to drive them to medium/loud levels?

thanks

Steve
stevecuss
Post removed 
09-09-09: Stevecuss
I'd prefer a tube power amp for WAF and convenience - I can hide it behind some fake greenery in our AV cabinet...

Tube amps that I've owned throw out more heat than any Class A SS amp I've owned. So you may not be able to hide a tube amp in your A/V cabinet. Just something else to think about.....
Hi Jmcgrogan2,

thanks for that input and I'd considered heat. Our AV cabinet is open - a cutout in the wall of the house, essentially, so it has plenty of ventilation above and around it. I use a fake green planty thingy in front to cover the front of it. Who knows, maybe my wife will love the glow of tubes...
I would go for a tubed preamp first, although a tubed power amp would be a natural step forward in time.

There are good options in the used market from Melos (SHA1 sig), Audible Illusions or Counterpoint.
I have just seen an Aranov preamp here at AGON that looks like what you are looking for...(I do not know the seller and/or interested in pushing this item) just a safe disclaimer. :)