Great, our favorite topic - spending other people's money :->
Although I don't have any expensive gear, a few friends of mine (P&S owners) keep asking me to shoot family events, like their kids' birthday parties (one-eyed man in the land of the blind...).
Your buddies seem to think the same - why buy gear for thousands of $$$ if we can talk someone else into it :-p
- 18-135 kit lens
- 50 1.4 lens
- Speedlite 430 EX II
Cheap?!? Imho this is decent mid-range gear, maybe except for the lens. This should be absolutely sufficient for what you describe if you can handle the gear and don't want to do life-size prints. A ff camera with a thinner depth of field would even be more challenging...
- Keep the 60D, buy a 17-40 instead of the 10-22, and make do with the 17-40, 50 1.4 (and zooming with my feet) and the kit lens until I decide to take the plunge and go FF?
That would be my advice, actually I'm just out to get a 17-40 for my 60d myself and use it there until I grab a ff body.Please: don't let yourself be talked into buying gear you cannot handle (yet!).
When I bought my 60d 2 years ago I thought about the 5d2, but I now know that it would have been wasted on me with my experience then. Just keep using the 60d with ef lenses until you maxed it out and really know that the limit is the camera and not your experience, and only then go get a new body. By that time, that'll be the 6d mk2 or 5d mk4 - and you'll have saved a lot of money and skipped piling up mediocre high-iq shots.
But it's your money, and Canon depends on people buying high end gear to feel more secure :->