I'm with KK. I'd wait for a Glock 17 to come back in stock unless you are interested in the gun primarily for competing. I didn't realize the demand on 17s were that high, but I would imagine that the LGSs would get them back in stock regularly.
The Glock 17, or even 19, are better all-around guns than the 34 IMO. While I do very much like and enjoy shooting my 34, I don't think you lose much if you had the 17. Two of my Glock 17 holsters can accommodate the 34, but they are open bottom designs from G-Code. That said, accessories, including holsters, are readily available for the Glock 17 whereas the selection gets a little more limited with the 34.
I wouldn't say the 34 has any less recoil than the 17. It might, but I never really compared the 34 against the 17 in that regard. It's not like recoil is a significant concern with either the 17 or the 19 with a solid grip.