Well, to be fair, if you use higher quality cable it'll make it easier to crimp too! But don't spend a fortune...
I've found it very hard to cause any real problems to CAT5. So long as it's not right next to a power cable, you should always be fine.
(Stuff going through the coax will be a completely different frequency to what's on the CAT5, so hence why there won't be a problem there.
)