how much should a 1THs rig cost?

hi! newbie here.

currently testing my gpu, its doing only 44mhs (produce 0.00000005 BTC in a day) lol.

from the wiki of asic hardware. it seems antminer s5. has the highest ghs with price under 500$
base on alloscomp i can mint about 0.37707047 BTC ($89.96) a month.

is that i good hardware to start with? is the computation of earning accurate?

thanks!