Yes, that is about the size of it.
As we all know the cost of maintenance will vary depending on how lucky you are and where you go but most Cirrus owners use the same few maintenance shops.
Obviously some items could be more and others less and doubtless with a real eye to costs and cheap parking you will do better.
I dont think there is any reason that a Cirrus will cost substantially more than a TB20, even if the depreciation on a Cirrus is probably higher.
I would also say there will additional costs associated with the need to replace the chute or the panels should you find yourself with the former time expired or the latter faulty.