I voted 4-599.
This would price it reasonably within reach for power shot users, without conflicting too much with the rebel line.
Any higher, without external manual controls, and it's a dead duck. Of course I fully anticipate that the 4-599 will be dollars in the US and pounds in the UK.
Canon 7D, T3i, EOS M, EOS 3, GoPro HD Hero & Hero 2, powershot sx230 hs, Canon 70-200 f2.8 L, Canon 100mm f2.0, Sigma 70mm f2.8 Macro, Canon 50mm f1.8, Canon 22mm f2.0, Sigma 18-50 f2.8, Tokina 11-16 f2.8, Lensbaby Composer, Holga HL