I am a HUGE fan of GUE training and would recommend it to anyone who wants to improve their diving. Having said that, I agree with @NetDoc and believe that 17 dives is a little low to do Fundies. Of course, there are different schools of thought here - do it as early as possible so you don't have to unlearn "bad" habits vs get some baseline level of comfort in the water before you do the training. After my experience in Fundies 1, I fall in the latter category. Every diver is different, and I was certainly below average before I did Fundies, so your assessment and experience may be different.
So far, I've done Fundies 1, a drysuit clinic and am doing a doubles clinic in 3 days with a GUE instructor. I can think of very few reasons to not continue with them for my future training but an important factor to keep in mind is that it's a significant commitment. Not just financially (training costs as well as equipment costs) but also in terms of time you put in during the training as well as after it in your own fun diving. Personally, I feel like it's difficult to decide stuff like this so early on in your dive career. I was lucky enough to have a large GUE community where I live and dive and I got to experience the system with them before I signed up for the training or spent any significant amount of money on gear. I would encourage you to do the same as well if you're considering this path.
Do you already have your own equipment? GUE and some other tech agencies have specific requirements and this may be a deciding factor as well.
You mention learning how to deal with accidental deco - good training at this level is about dive planning, situational awareness and keeping track of your dive so you don't end up there.
As @Jim Lapenta mentioned, customized training in the form of a workshop as opposed to a certification is also a great option.
Thanks for the input. One main problem is that I'm in DC, so no real water around, which means diving for me will typically be once or twice a year at most. I don't own any gear yet, though plan on buying a dive computer.
Given that, I think it probably makes sense to do some more recreational dives before doing GUE. (Or something simpler where I can rent gear and just spend some quality time with a top notch instructor working on more safety drills and trim adjustments).