Great to see you enter the hobby. I would always recommend the Sennheiser HD 598, but they are definitely bass light.
I wouldn’t be the best to give advice since I didn’t listen to all that many options. The Phoenix is definitely a good pick, it might be better than the Deva because it’s not as hard to drive (planar-magetic headphones need a very good source) - I would suggest you wait for the release of the new pads before buying the Sivga Phoenix.
No other headphone is popping up… there is Thieaudio Phantom, but I don’t know much about them, cannot comment.
The Phoenix is a very great headphone, but those pads… Just give Sivga some time, they will send me the pads when they are completed, so I will be able to immediately post if they are any better.
Monolith is targeted towards the masses, not audiophiles… and I didn’t hear anybody mention that Monolith product is their favorite, at least not on audio enthusiastic forums.
I am getting the Dekoni Blue next month, I have yet to see how they perform. They are planar magnetic, so you might have a problem powering them. However, they are using the Fostex T50RP MKIII (I believe), and Fostex headphones have been some of the most respected in the industry. There are also some Audio Technica models, but I didn’t have any experience with them. You have the Dekoni Blue for around 250 bucks, and that’s a pretty good deal (you also get the best pads from Dekoni).
Just like Dekoni, there are other companies that have produced their version of the T50RP headphone - for example, the Argon MK3 ($245). The Argon is highly respected in the community, but I haven’t read about it, so I cannot tell you about how it sounds.
Then you also have the two headphone models from ESS Labs which is using the Heil AMT driver.
These are just about all the option you have (that I consider the options worth of your consideration). I did my homework and know the majority of the market, but I do not have experience with the mentioned products. This being said, I hopefully helped you by bringing these models to your attention, it will hopefully lead you in the right direction.
@TylersEclectic @Resolve @Torq - ask these guys, they are the founders of this forum, they have some experience in the field, so they might be of help. Andrew is the owner, but I assume that he is mostly taking care of the business side, so he doesn’t have too much time.
If the above mentioned people cannot help you, go on Head-Fi or HiFi guides, ask there - people should come to assist quickly.
If you need help with other forums or anything else, feel free to shoot me a PM, I’ll do my best to help =)