Hi James74,
I too have the ETX125 and agree - it's a great scope in many ways. Bit of a shame you didn't decide you wanted one a couple of months ago when they were about $400 cheaper
I tend to agree that colour filters probably won't get used that much, - so there are loads of better things to spend your money on. Certainly the items that Brian and Jeff have suggested are pretty essential.
Good luck with your new toy when you get it
Cheers,