With those weights I would consider upgrading, but with my weights my bars are fine, once I squat 200 I too would upgrade, but personally I think that will never happen for me, due to injuries from my past, I am more that happy with where I got as it is.
If the op recons the most he will ever lift is 150kg then I cold see no point in buying an expensive bar for quite some time, and my $50 bar is 28mm and rated to 250kg, handles 180kg deads with ease, and will handle 200plus deads, I squat my 150kg with a 20 year old home made bar, and I am sure it will go well past 180kg with no issues for safety what so ever.