A triplet from anyone would be more than adequate, but you may want to start out with a 2nd hand ED80 APO to get started, you can usually get one for less than $400, and it will keep you busy imaging for a couple of years. With an unmodified Canon, an ED80 will realistically be as good optics as you need.
I would probably just start out with the camera on a piggyback mount and shoot through its lens until you come to grips with tracking, guiding, stacking etc. That will cost you a total expenditure of about $30 and you can see how you go with DSO photography.
You could also grab a f6.3 reducer and shoot through the Celestron for some smaller objects.
I think diving straight into a triplet unless you have a lot of cash to burn wouldn't really help when starting out. If money isn't an issue then by all means grab a TAK, otherwise almost any ED80 will more than fit the bill for your first year or two, and you can always resell it for about what you paid for it. The ED80 won't be the limiting factor on the quality of your images for quite some time
Save that money for guidance systems, software, the inevitable camera upgrade and the rest of the things that get thrown into the AP moneypit!
