I did the same thing. I bought a starter bike. I loved it sooo much... for 2 whole months. Then I wanted something faster and lighter and more comfortable. I spent $500 on the starter and over 5 times that for next one. It was actually a far better bike and far more expensive bike than I had ever intended to get. I was shaking when I was paying. What am I doing? Will I ever ride this thing??? It was ultimately some of the best money I ever spent. This is not to say you have to spend this much. I happen to be a challenging fit and this is what felt good. And I was lucky to be in the position to pay for it. But if you can swing it, don't be afraid to spend a little more and get the nicer bike. You'll be grateful later.

Good luck!