Windhelm (near the stables) is a good location to test for crashes. The road from Dragon Bridge to Solitude (after Meridia's Temple when going up north) used be a place of choice for CTD when I was using ugrids at 7.
If you want to avoid a lot of frustration and hair pulling, get back to ugrids 5 (use the distant details mod), try to stay with 1K textures packs (maybe 2K for armor & weapons, 4K for character skins if you like to look at your toon) and get a good ENB. And avoid using every ini tweak floating around, a lot of them do more harm than good, IMO.
Also, be paranoid about what you download. Small animals skin textures weighting 5 MB each, when you can barely see the thing moving, or 22 MB for clothes textures, everything is eating at your memory. Slap them with the ddsopt stick, you won't notice any difference.