Well, the choice is yours, of course. When the Droid originally came out in November. My goodness! Do you remember all the excitement? Then the news came out that the Nexus One and the iPhone was coming to Verizon. So, I decided to wait.
Both rumors turned out to be false. I waited 5 months and eventually got the incredible on pre-order. I liked it but had trouble with the call quality. This was bad because I run my business of it. So, after 59 days Verizon took my phone back.
I then ordered the Droid X when it came out. The call quality is superior. It's a great phone, especially when rooted. Am I glad I waited? Well, I missed out on 5 months being with Android. I was stuck with a Windows Mobile phone (shudder).
I love the phone. It's great, but in retrospect, I might have gotten the Droid 1 back in 09 and upgrade the end of '10 or '11.
Bottom line: The DX is here now and it's great. The next phones out aren't necessarily better. I do not believe that the Samsung Fascinate is better than the DX because it is newer.
I'd get it and enjoy it, if I was you. I am, however, not.
Good luck and let us know!