Hi bumbleaidz, welcome to the Cameralabs forums!
That's an interesting question and it really depends whether you think the two lenses will cover all your immediate requirements. the zoom obviously gives you more flexibility, a longer range AND image stabilisation, BUT the primes will be better quality, smaller, lighter, optically brighter - and will also force you to move around your composition for the best angles. Remember not so long ago, most SLR film photographers made do with a 50mm and little else...
So yes, if you're after a 50mm equivalent prime, then a 35mm is a great choice - just be aware the Canon EF 35mm f2.0 is not a USM model so its focusing can be a little noisy and slowish. You may wish to alternatively check out the Sigma 30mm, or consider Canon's 28mm f1.8...
The EF-S 60mm is also a great choice if you're into macro shots and will also serve as a good portrait lens too.
So it's really a lifestyle choice between the convenience of a zoom and the purist approach of primes - only you can decide!
If you are buying through Amazon though, do consider doing it via our Affiliate page here:
http://www.cameralabs.com/reviews/Affil ... ping.shtml
PS - if you buy the 40D kit with the 28-135mm, they do sell you the lens quite cheaply, so it can be worth having it as a backup even if you intend to go with the primes in the future...