Samsung M520 Accessories

OK, I have a Samsung M520 phone and I just got a few months ago. Now my phone company wants to say they might be switching carriers to Verizon. I just want to know what phone is just like with almost the same accessories. as micro SD card slot, USB cable attachment, 1.3 megapixel camera / video (or better), things like that because I do not want to change phones and not be able to use my SD card as I do now, or be able to connect via a USB cable. it would mean trying to find someone to buy the camera and accessories, and I do not want to do. and I would be able to sell the phone when i switch somehow?

The best phone for Verizon slider to the right is now probably the Motorola Z6c. Its basically a RAZR thats a cursor. Heres the CNET review (its rating a bit higher than the M520)
http://reviews.cnet.com/cell-phones/moto ...

Yes, you can sell your phone to anybody as they have Sprint (or are willing to also purchase an unlock code). Try ebay, I bought several phones from eBay.
Ps-I have a M520 also =)