Relax, you have the rest of your life to fine tune your garden.

I don't know many of those roses, but do know that you will learn a lot from growing them.

And the shovel can be a very good friend: to move a rose which doesn't like the spot you've picked and to permanently evict it if you decide there's no hope for it.

The two gallicas are not that much smaller than the albas. This is going to be an enormous bed, and is going to need some sort of access paths through it. It's also going to have a relatively short season of interest unless some other plants life goes in. For me the ratio of roses:other plant life should be at least 50:50.

My guess is that just the roses is going to be about 15 ft deep and a bit wider.

Stan,
I agree with mad..g. To add more to your plan...my Hippolyte (on multiflora from Pickering) got around 8 ft tall in her second year. I was considering mentioning her as one of my monster roses...but, she's nearly thornless and absolutely wonderful for me...almost disease free if not totally disease free.

Robert

Right-o to what everybody else says. I never plant my roses more than two deep, and then only if I can access the bed from both sides. You need to be able to get at them.

I heartily agree with madgallica that you need other plants besides roses. Spring bulbs are wonderful under roses. Plant some clematis to scramble among the roses and bloom in the summer. Get something evergreen for winter--a columnar yew? how does box do in your area? Other shrubs for variety of foliage and bloom and fruit, for fall color: viburnums and barberry offer possibilities. Late summer flowers, perhaps Japanese anemones or dahlias. If you offer room to these other plants, I think that in the long run you will find that your garden will be more beautiful and more interesting over a longer period. If it were me I'd eliminate some of the doubles, but that's my style--well, all of this is--and not necessarily yours.

Melissa

You do know that Charles de Mills will send suckers all over your bed don't you?

I love white and mauve together; to me it's one of the most beautiful pairings. If you do pick companion plantings that don't have these colors hopefully they'll bloom later. However, yellow can also be very good with those colors, like daylilies.