Hey folk! I have been looking into buying a cheap mining rig

I found a cheap rx 470 and bought it right away. Planning to mine Ubiq with the GPU. To offset investment costs I went looking for a very cheap second hand decent pc. I found a few, with different cpu's and price ranges

The i7 930 (cheapest) (idle system power 112W*, peak system power 240W**, does have 2nd PCI-e slot on mobo so I can connect more vid cards if i can get my hands on some)
FX 6100 (more expensive, don't have details on mobo yet,idle system power 99W, peak system power 225W, 220MHS on monero)
FX 8150 (most expensive, dont have details on mobo yet, idle system power 100W, peak system power 252W, 330MHS on monero)

* +** idle and peak system power numbers are plucked from benchmarking sites to benchmark the CPU real load through socket meter

I pay 0.1799$ per/kwh

So is CPU mining combined with GPU mining unprofitable in these cases?
Should I not try mining with these CPU's and go for the cheapest option, the i7 930 or for the little more expensive, but lower idle power FX 6100.
Or should i try to mine monero for example on my 6100 or 8150, while using the GPU to mine UBIQ?

Orrrrr should i keep looking and find a cheap celeron with a tdp of 35W.