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Slower card means it takes longer to save an image. This probably won't matter too much if your using it for astro stuff but it would make a big difference if you're trying to shoot stills continuously.
I'm sure if you got a really slow card the camera wouldn't be able to reach it's potential frames per second, but I also don't think the 350D is going to use a top of the line 90MB/sec extreme pro to it's full potential. So somewhere in between.
I've always been happy with my Sandisk Extreme 60MB/sec cards and if they're fast enough for my 5DmkII I'm sure they'll work for you too.
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