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I have both the ED80 and the 127 Mak. The Mak handily wins for viewing planets but it's focal length is relatively long and I don't find it as good as the ED80 for deep sky. The ED80 also wins for photography (being much faster) and is a handy daytime birding scope too. If I could only keep one, it would be the ED80.
Rather than spend extra on a goto for a dob, you could mark out 360 degrees on the base and have an adjustable pointer to make it a push-to. For altitude, either a protractor or digital inclinometer will work. I have this setup on a bunch of home made alt-az mounts and with sky safari on the ipad, I can find things pretty quick. Or just star hop using sky safari (or similar) and a red dot finder - for my money, goto's take half the fun out of finding stuff - not to mention all the grinding sounds they make!
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