Dutchoma it is such a pleasure choosing roses that of course the choice should be yours. However if you have not already done so, do get the David Austin Catalogue just for the pleasure of looking through it even if you don't end up with any of their roses!
I think red and orange could be a lovely combination (but you would need to chooses reds and oranges which work well together) as would lots of pinks of different varieties.
Yellow roses are really cheerful too.
I have the following roses:
White/cream: Mme Alfred Carriere, Coopers Burmese, Sally Holmes, Generous Gardener
Pink:Gertrude Jekyll, New Dawn, Rosa Magenta bleu, American Pillar
Red: Dr Du Jamain, Munstead Wood
Orange: Mrs Oakley Fisher.
Some are climbers, some are shrubs in the border, and some are in pots. I choose roses which are hardy, don't mind shade and are scented.
My mother has another 20 or so varieties in different borders. However
the very 'seventies' overpruned roses of my mother's garden, with no companion planting - a bit like the roses in Queen Mary's rose garden in Regents Park don't really appeal to me. For me the best way to grow roses is the Sissinghurst or Giverney way - to let them either climb freely (and well supported) up a warm wall or to grow as large and vigorous shrubs to really let them flower abundantly in a mixed border.
Yesterday I saw a very pretty rose border in a front garden- palest yellow and pale orange roses (a bit like Compassion) interplanted with pastel ivory and lemon and pale pink dahlias- a very very pretty mixture of flower form- and quite an unusual colour scheme as it was all about light pastels, rather than the more modern deep purple/maroon themed borders. It was also very feminine, and made me think about how much garden design these days is male dominated.