If you need wide viewing angles then IPS is the way to go.
You'll probably want to look into the Sony x800e and LG UJ7700. Both have IPS panels, wide color gamuts and 49" models. The Sony even has a 43" model.
Each has postive and negatives against one another.
- x800e is a true 4k panel, not an rgbw panel on the LG which is considered "fake" 4k
- Both have roughly the same contrast ratio being IPS panels, but the UJ7700 has local dimming while the x800e does not, although it's not a good local dimming function
- The UJ7700 gets a little brighter than the x800e in HDR content
- Colors should look a little better on the Sony vs. LG, RGBW panel making a difference here for the LG not being as good
- The UJ7700 is definitely better at handling reflections than the x800e, so consider that if it's going into a bright room
- The UJ7700 has unbeatable input lag, much better than on the x800e, but the x800e's is still very good and unless you're a competitive gamer you wont notice a difference
- The UJ7700 supports dolby vision and hdr10, the x800e only hdr10
up to you to decide. The UJ7700 beats the x800e in many thing, but the RGBW panel does hold it back some. The UJ7700 should be a little bit cheaper than the x800e, so something to consider.