I dont see why people are talking like the 42 is SOOO much bigger than the 37. Its 5 diagonal inches people. Thats like 4.4 inches wider and 2.5 taller... (Someone check my math) If youre sitting a few feet away that shouldnt make much difference.
After using both, I honestly prefer the 37" to the 42" for a computer monitor. The 42" is a VERY nice screen though and I prefer it for movie watching.