Hi pulseimages!
I would second that. Depending on your overal budget the Canon T&S are maybe out of reach if you don't get a great catch used.
But a Samyang could be within reach and the IQ is very good AFAIK (disclaimer: I don't own one).
Something maybe a little bit more versatile could be one of the WA/UWA EF primes with IS, depending on the focal length you prefer.
AF and IS are their main advantages over a T&S and so you could use them for night photography or classic cars e.g. when they drive by.
I own the EF 35/2 IS and 28/2.8 IS and love both of them.
This is something I would recommend only if you feel that the IS is missing.
Even though you can see some advantages for the new one at the
TDP lens comparison esp. at the long end (200 mm) my guess would be that in daily shooting this will be not visible.
If you use your macro a lot in the field, handheld, then this could be a really good idea.
That's what I do shooting insects.
But you would gain the HIS only, as the IQ is on paar.
I can tell you from personal experience with both macros.
Hope that helps.
Enjoy you GAS