So now the inevitable happened: motherboard failure

Luckily all my material is fine and recovered, but I have to decide on how to proceed.
I have an iMac with 16gb RAM and El Capitan that I use for my day job when I work at home and I was thinking I could use for this my music production also, but it seems like most of my equipment/software is too old to work here.
So it´s either find a used computer with Windows XP and install all my old stuff or get new stuff, I have decided to go with the later.
I really like Pro tools but would I feel familiar going from 7 to 12 ?
Considering Duet with Pro tools but should I consider other DAWs? ...seems very expensive with the subscription deals Avid have now.
...really really trying to motivate the purchase of komplete 10 ultimate in the process while it´s on sale

/Anders