Well, faster is better if you want to hit with more power, but your going to need bat control, as you do pitching control if you are a pitcher.
for it does not matter how fast you can swing or throw if you can't get the job at hand done!
A good target for HS is 90+. This is not very hard to do if you have good mechanics and strenth.
It is interesting to note that my bat speed has always been close to my throwing speed. I don't think there is a correlation but this has been so in my case! But I don't think I'll be seeing 105-110 mph.