I have never owned a Nokia, so the Lumia brand a no special value for me, when i buy a phone i want 4G, Micro-SIM and SD Card, AFAIK this limit me to the Lumia 625, 630 and 1320.
The 1320 is too big and heavy compared to my Galaxy Note 3, the 625 and 630 are a little subpar in screen resolution, i have 800x480 on my HTC Desire in 2010, for this screen size i will probably don't go below 1280x768.
Tried WP7 some years ago, it was a HTC HD7, i wait to see more choice before trying WP8, i will probably play with something from HTC, Samsung and Sony once they are available in the showroom of my favorite shop.