What's your soil like? Is it particularly boggy/dry/clay/sand/acid/alkali? What weeds grow there naturally? And how much sun does it get?
As an example, we have a front garden that gets midday/afternoon full sun, and I've been stuffing it full of frothy cottage garden flowers. I spend hardly any time on it. Ours is edged with lavender, and the roses I have in the front are: Dioressence, climbing Mme Gregoire Stachelain, New Dawn, Felicia, Rhapsody in Blue.. All either very pretty and/or smelly. You might want to look at the Stachelain rose as that's a good climber. I find New Dawn a bit wishy-washy in full sun.
Other things to consider: Gaura, Lavatera, Sidalcea, perennial sweet peas, sweet williams.. Definitely agree with the 'buy something in flower every month' comment - seems to be working for me.