Currently mining with 1600 ryzen and 980...thoughts on 970's?

Morning All,

Currently mining ETN with the Ryzen and Zclassic with the 980.

Have the bug for mining now but trying to work out what is best for short term in order to get a bit of 'profit' under my belt to go for a all out mining rig.

The 980 is currently generating around £3.40 per day and I know with the 970 you can pretty much get similar performance to the 980...looking around you can pick these up for between £120 - £130.

Nicehash estimates around £75 profit per month so similar to what I get on the 980 now taking electricity into consideration.

Would I be daft to buy 2 of these for say £250 - £300 and run alongside my 980?

For similar monies what other cards could I get to generate a further £150ish per month?

Thanks guys!