100 m/s is the CQB-limit usually.
And no, the exit velocity does not do that much for range. It does make a difference, but not as much as most new people think

Most important is the hop up, both for precision and range. If you at some point in the future decide that you want to focus solely on woodland games you might want to step up to 120-130 m/s, or even a semi sniper doing close to 160 m/s. But with everything above 100 m/s you will get a minimum safety distance, if you are closer you are not allowed to shoot. And if you still decide to shoot you will get very very angry co-players, besides the point that you may actually hurt someone.
So for using guns over 100 m/s you need a side arm doing less than 100 m/s so that you can swap for close encounters. And you will not be able to play with the gun in any of the CQB arenas around the country.
Every field may have their own rules, but these are the most common limits:
vsaf_regler_chronolista1.jpg
S-avstånd = Minimum safe distance (no shooting if closer)
Edit: If you find a gun that you really like the look of, but see that it's over 100 m/s you can always request the retailer to swap the spring for one that will bring you under 100 m/s (M90 usually). Some will do this for free (taiwangun for instance) if you request it when you buy a new gun. Otherwise it should not be a big expense even if you pay for it.