Hello tan oak
I usually don't want to confuse people on this forum or superimpose my opinion on someone.
In your case however I need to give some advice.
Before I begin let me put my experience on the map:
I have the classical GAS Syndrom, especially before going abroad.
I usually travel with my family that is 4 people so our trips are never cheap. I use this as an excuse to by myself each time the equipment I desire for such a trip.
My kids are slowly old enough to allow me not only to use some of their weight allowance for my camera equipment but also to hang some of it around their neck so usually I travel with more than one body, several zooms and a few primes.
However I also love the EOS M and M3 and owning all Canon EFM lenses plus the superzoom for the M from Tamron I usually have a certain variety to choose from.
Let me say it straight: The M3 is a very decent supplement to any Canon DSLR but it is a desaster as the sole body when traveling and facing unknown situations.
The M is merciless to you once action is happening. Salsa Dancers in Cuba? Press the button a second to early and you are blind for two seconds. Use serial picture mode? Have a series of 3 or 5 pictures and be blind for 5 seconds. You might have a keeper among them but you loose control. The EV3 by the way just makes these things worse. For those who do not understand what I mean:
Try this picture with a M3
Neither the kit lens nor the 22mm are versatile enough for me.
The 22mm is loved by many people on this forum but that love comes from the age of the 2 lenses and the time of the slim EOS M. The 22 is fast and small but not wide enough for landscape and way to short for portraits as long as you do not want to bother your motive by being disturbingly close.
These days I travel with the EOS M3 with the 11-22 always on and the Tamron 18-200 and the Canon 22mm + the converter and the EV3 as auxillary equipment for special circumstances.
The moments when the M3 is worth the money:
1.
Mounted with the 11-22 as a companion to a Canon DSLR with the 70-200 (There are not much situation you will miss with that combo)
2.
Mounted with the 22mm in one of these inexpensive evamarine diving bags. very light, very small and water and dust proof when this is important. The speed of the lens and focal length fit my style when diving in shallow water or driving though the desert.
3.
With any lens as the HDR sidekick to a DSLR
The combination is light enough to be handheld or to be kept in place through a gorilla pod.
I get an amazing amount of shots I would have never been able to take with my DSLR allone whenever I have both the DSLR and the M with me, but with just the M I usually have not a single day during a trip where I wish to have even the most lousy Rebel in my hand. It really hurts to try your best to make the M do the picture and getting mediochre results while the soccer mom next to you nails shot after shot with her 450D in green frame mode.
regards