First.. Welcome aboard.
Next You want a new lens to do what?
I had to negotiate into my gear acquisition.. I informed my wife I needed a fast fifty, because i couldn't catch the kids with the kit lens. Really I was making an excuse because there is no way for them to out run a flash.
Then I added a 12-24, and 35mm ƒ2, then a macro lens, then DA 21mm ƒ3.2 Ltd and well.. needless to say, I have added lots of gear, each for a different reason. I sold the fast fifty, but upgraded to DA*55mmƒ1.4 SDM --> Point being, you have to start somewhere, and GAS or LBA is never ending, so justify to yourself WHY you need the lens, go out and use it for that purpose, then rinse / repeat for future acquisitions