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Hey Pete,
itīs perfectly fine to use an unmodded DSLR. Its just that the inbuild infrared cut filter of a stock standard DSLR also cuts some parts of the red spectrum in which emission nebulae glow (namely Hydrogen Alpha emissions-around 650nm wavelenght I believe). However, the spectrum of reflection nebulae and galaxies are largely unaffected.
It is a bit of a personal choice: you certainly get a beautiful horsehead nebula i.e. with an unmodified cam but to have the full beauty of those pinkish curtains behind it you probably need the cam being modified or better get a astro ccd with cooling.
I was thinking of modding my Canon too but decided against it as there are lots of issues afterwards when you want to use the camera for normal daytime use (whitebalance thrown off, focus problems etc).
Hope that helps a bit
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