I read most of the thread, though I started skimming near the end since it side tracked.
I would have to vote for a +1 LA. It's a strong +1 but that is better then +2. As a comparison look at a tiefling, they get +2dex, +2int, -2chr and some minor elemental resistances and a couple SLAs.
So for a Tiefling vs a Shade you loose -2wis, minor elemental resistances and SLAs and gain the ghost touch. It's a bit better but not a ton. Thats why I say +1LA.
I would have to vote for a +1 LA. It's a strong +1 but that is better then +2. As a comparison look at a tiefling, they get +2dex, +2int, -2chr and some minor elemental resistances and a couple SLAs.
So for a Tiefling vs a Shade you loose -2wis, minor elemental resistances and SLAs and gain the ghost touch. It's a bit better but not a ton. Thats why I say +1LA.