Looks like you have pretty much everything your going to need already.
It depends on if you just want to use your cameras with their lens's but as you have a 600 f/4 you have very nice little lense to do some good widish field shots.
Your running on a budget and want to use your camera so, go with a HEQ5. Get yourself a 9 x 50 Finder scope, Qhy5 ccd for a guide camera, and a side by side plate to mount the camera and the finder scope to guide.
1000 for the mount
300 for the guider
another 100 - 200 to get the side by side + adaptor machined up.
That would be the best situation. there are short cuts and things you can change.
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