In need of recommendations.

Hello gentlemen, the purpose of this thread is exactly what the the title says.

I am not that well versed in the headphone world, and nor do I have the luxury of trying out headphones at a physical location, so it is my hope that someone can intervene and help me out. 

I am in need of a solid and great sounding full size headphone. I very much would prefer a closed design, but I may consider open if it's simply superior to closed offerings

My likes: I like good instrument separation, AND bass. Not Dr. Dr Beats bassy, but I do like my music to feel lively. I cannot use specific audiophile terminology, because well, I am not an audiophile.

Headphones I've purchased and tried: AD700, SR-60, ATH-M50 and Denon D1100.

What I am considering: Denon D2000, and Sennheiser HD650.

Thanks for replying MalVeauX! 

I guess that's that then. So, the D2000 is more fun to listen too, eh? How about comfort-wise, between the HD650 and D2000: which wins?

Thanks for the replies guys.

Regarding the headphones I've tried:

The SR-60s were the first entry-level "audiophile" headphones I bought. They broke on me after 6 or so months of use. I don't really remember their sound that well. What I do remember, is that the instrument separation was lacking, and that they were ill-suited for gaming (gunshots were deafening). They and the D1100 are the most comfortable headphones I've tried.

Next up the AD700s. The instrument separation and sound stage on those are terrific, and the sound signature which I can best describe as being "airy" is very pleasant. However, the lack of bass really are their achilles heel. It's really the lack of bass that make them an "incomplete" headphone in my opinion. Plus, for thick rimmed glasses wears such as myself, they don't fit well.

I bought the Denon D1100 because I read they were a smaller brother to the D2000 and I couldn't justify the $350 price tag on the D2000 at the time (after researching that they went for as low as $200 in the past). Anyway, I liked their sound a lot, they did a lot of things decently in such a small package, but their build quality is just god-awful. The headband is just made out of this filmy plastic. Right away when I bought them, I knew they were not built to last, and I was right-- they broke after two months of usage. If the D2000 sound better (what I'm hopping for) and they aren't as flimsy (what I'm hoping for too), then I think I will be a happy camper.

Now bringing me to my most recent headphone purchase - the ATH-M50. I immediately noted the neutral and analytical aspect of this monitor class of headphones. They don't have enough instrument separation or bass for that matter, to my liking, but they're a very good jack of all trades headphone.. Anyway, my main gripe with them, is that they're too uncomfortable. The clamp is too strong for my head, and they don't expand enough to give me my desired level of comfort. I am currently trying to see if I can get used to them, because I feel very lazy about returning them, but as of right now, I think they are going back.

I just opened this thread to see if anyone can recommend me something specific for my case, and something I haven't heard about before. Hopefully, you guys can enlighten me some more before I make another ignorant purchase. I just don't want to take another shot in the dark. So please, keep the suggestions and input coming.

Thanks again.

In my defense, I have a very big head and so that may be why headphones don't last with me. The SR-60s literally came apart one day as I was putting them on. My theory is that too much pressure is exerted on the headphones to accommodate my big head.

Like I said before, I really want to keep the M50s, but they're just too uncomfortable. Especially after wearing the D1100, it's hard to go from them to this. Can you recommend any other headphone in this class for my specific situation?

I'll be doing research on those. Thanks mate.