Hi Pembroke - here in my zone 5 garden, I pot the more tender roses in large 28-30 inch diameter pots and fill them with an light artificial soil (which makes it easier to move the pots into the garage for winter). I use a slow release fertilizer with it in the spring and sometimes a liquid 'booster' if the potted rose has been a heavy bloomer. I just moved my potted roses into the garage last week and will bring them out in April when the weather warms up a bit. They can take frosts O.K. but freezes are hard on the new growth.

I wouldn't think you would need to bring Marie Pavie inside at all.

I grow Marie Pavie' in a pot which is already moved into my unheated greenhouse. The soil will freeze solid in January but it will thaw and need to be pruned in late February. Mine is moved outdoors in late March/early April and is often covered with buds by then. Even with late frosts it still blooms early.
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It's been in this pot for five years. It was planted in Miracle Grow potting soil. I add a few organics as soon as the soil thaws each spring.
A similar pot on the other side of the arbor is planted with Chrystal Fairy and performs like Marie.

There is a container gardening forum here on GardenWeb that talks a lot about soil mixes. I use Tapla's Mix that I have adjusted in my own way. You will also find a lot of information on water retention and fertilzing that contradicts what you learn about here because most here grow roses in the ground. :) The pot ize varies, but my 8 foot Mr Lincoln is in a pot that is 22x22x22. That is my basic pot size, but some are in smaller pots and a couple are in larger ones. I will root prune next year or upsize into larger pots for 10 of mine, and a few are going to the house to go in the ground. I do not have to worry about hardiness as we rarely get cold for more than a few days at a time.

Fertilizer in containers is different as well, and may be art of my problem with yellowed leaves in some of my pots. You cannot (according to my research) usse organic fertilizers in pots because the soil cannot break them down properly. Chemical fertilizers work best in potted plants.

Here is a link that might be useful: Tapla's Mix