Hi there Alexander!
Welcome to the forums!
It does seem as though you have "the bug"... the "aviation" bug, that is.
Knowing that you want to fly for a living... especially after having 260 hours under your belt... means that you have a bit more of a headstart and understanding of what it may take than those starting with 0 hours.
Since you already have your Instrument under your belt... then you certainly do have several options. There are many folks who go to ATP with an Instrument or Commercial rating already printed on their licenses. Many of these folks just really want the experience of flying all multi-engine aircraft with the opportunity to fly across the country into very diverse airspace... all the while learning and preparing for your CFI, and paying only 1 set price for a program with a defined start and end time.
But... that's not to say that the standard FBO route could be good for you. You already have experience with that it seems. While it appears cheaper... you still have to deal with aircraft availability/realiability, and you and your instructor's schedule. For example... it took me almost two years to get my PPL for those reasons... but yet it took me 90 days to get the rest of my ratings in one shot.
There are certainly FBO's out there that are the exception to that... and all it really takes is some hardcore research to find one that may be close to you.
ATP will be getting access to the DJets once the FAA give Diamond final approval. Then ATP will start receiving their own aircraft shortly thereafter. Originally, the timeline was for ATP to have access to the DJets in late 2008 and start receiving the aircraft in 2009. However, I believe that those dates may be backed up a bit due to Diamond finding out that their original engine is underpowered, and have thus decided to change to a higher performing engine. That will delay the FAA certification, and thus... ATP's aircraft as well.
At this point... my advice is to keep your research up, and keep paying down those student loans as much as you can.
The industry is in a bit of a lull right now, even though there are still carriers hiring. But, I believe that a lull is a great time to learn to fly... because you don't feel as "rushed" to get done and get hired. I'd use this time to get your ratings and get your CFI so that you can start instructing to gain even more valuable experience... and start getting paid to fly vs. paying someone else!
What do you think so far?
Keep in touch, and I'll be happy to help you with your research as well.
Bob