Would you invest 2000$ on a 140MH rig? Forget what the GPUs are I'm talking about MH wise, is this a good investment or a bad one?
If the rigs is pc then is worthed, if asic better buying coin then, there is no single gpu can do 140mhs at this very moment, and dedicated gpu mining from nvidia has no resale value in the future, dual rtx 3060ti or 3070ti should be fit in your budget
If the rig contains like 2 big cards like Rx 5700 xt, 6700 xt plus a single small card like a 1660 Super or ti then I think it is very much worthy as if you buy these components alone you will pay more than 2000 dollars.If the rig contains old cards but in bigger quantity like 6 x 1060 then it is not worthy as those cards have been used really hard a couple of years ago when they were very efficient back then.It all depends on what is your gear,GPU-s are very important as the newer ones you get better hash rate also in Ravencoin mining a thing which you don't with old ones.