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The 180 Mak is certainly a good planetary scope, but I think the first question you need to ask yourself is how is your current dob letting you down and how will the Mak (or any other new scope) address that.
Looking at your list of gear, you should have to trouble hitting atmospheric limitations - the powermate plus 5mm eyepiece would give you a healthy 600x magnification, and that would require some extraordinarily good seeing to pull off! Even the delos with the powermate would see your dob hit a more manageable 300x magnification (and is a very nice combo too). Your powermate effectively turns your 1200mm dob into a 3000mm dob - pretty comparable to the 2700mm Mak, except your dob has an extra 70mm of aperture.
Actually, I think your equipment 'weakness' is actually at the other end, you are lacking a nice wide-end eyepiece for the bigger DSOs and beautiful star fields. You need to upgrade from that included 25mm job!
The Mak does have a few pluses - it's smaller and lighter than the dob, which means you might be more likely to use it if you have to move your score around. They are pretty hassle free and are will known for their performance on the moon and planets - if you are big on viewing the planets having such a dedicated instrument can make a lot of sense. Having two scopes can also mean you can hunt two different objects at the same time (or share your viewing with others more easily!).
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