I thought I will put you out of your misery.
When I first started photography, I somehow follow the same path.. but what you need now without factor in the future.
I will buy a better lens that the supplied kit lens. then upgrade to a better lens but deep down, I know I want the f2.8 zoom but wasn't ready to do so but every time I bought a compromise, I know I am not getting what I want and that feeling is killing me. I am sure most feel the same way but never admit it.
At the end after a while, I give up and just bought the f2.8 zoom and have never looked back. The thing is, it was expensive purchase but a lot cheaper if I buy it right from the start and save me lushing for it and always blaming my gear for my bad photography.
Once you have own the very best and if you still can't get good pictures, you can safely say to yourself that you are the one to blame and it is the fastest path to forget about the gear and concentrate on photography.
I have tried every single lenses that is available in Minolta MD range to Minolta AF range through last 5 years and I mean, every single one but sold most because I just "want it" rather than need it.
Nothing beats the feeling of using the best lenses for your work and get what you want from it and you can take full responsibility on your work.
Hope it make sense and you make your decision on your gear purchase.
Regards,
Hart