That's a very uneven shortlist
The B&W are just as trendy, overpriced and cheap sounding as the Beats.
Sennheiser HD650 is a great headphone for the money, but without a proper source and amplification it's very much a waste of money.
HD600 is a bit easier to tame, can be bought cheaper, so it may be a better option.
Grado RS1i is a 700$ headphone. You do realize that, right?
I haven't heard the new i version, but I own the older RS1.
It's easy to drive in absolute terms, but without a high quality source and amp I don't think you'll be able to really get why you've paid 700$ for them.
I'm not going to recommend to you any of the headphones mentioned. Instead I'll give you a piece of advice - hang around more on head-fi, do your homework and start small.
There are a lot of headphones under 150-200$ which sound absolutely great, and way way better than what you're used to.