What's funny about vocals is that there is more than one way to make this happen.
The tradition is something like a good combo of mic, preamp, EQ, the right amount of in tempo delay and reverb. If the vocals don't sound good, then you're mix won't. Thats just a fact.
If you're looking for an elaborate production, then yeah, maybe renting expensive gear will do the trick. But these days, you can do just as well with a 400 or 500 dollar mic. Of course more expensive mics can easily put vocals in thier "place" with little or no EQ.
Sometimes, the secret is in the mastering stage. As a professional engineer, we practice something called "The Group of 4".
1st is your full mix (everything together in stereo or surround)
2nd is called a TV mix (instrumentation with only chorus vocals)
3rd is your instrumental mix (no vocals)
4th is your lead vocal mix (just vocals)
This involves creating "Stems" of your mixes.
So for example, this means that after you're done with all your mixes and you feel that you got it as best as you can possibly get it, you start creating your stems. You'd do this by soloing your groups with thier appropiate FX and recording them into a stereo track. So lets say you're doing your instrumental mix stem, then you mute all your vocals and record the music into a new stereo track (WITH the FX).
Then you mute all your instrumental stuff and solo out your vocals and do the same.
You can even get more elaborate and make stems of even smaller groups. A drums stem, lead instruments stem, back ground vocals stem, etc.
This allows the mastering engineer later on to re adjust anything just in case the full mix has any problems.
So essentially, the mastering engineer is almost acting like a second mixing engineer.
Producer/Engineer & Studio Operations