[Cin] Question about proxies and wide gamut screen ICC profile

Hello, I may have missed it in the manual, and I haven't done it in a long time. So I am looking for recommendations. What proxies do you recommend if the mixed footage include .MTS or .mov files compressed with H.264/MPEG-4 AVC; 1080 24p to 60p. My main computer is older (AMD Phenom II 4 965 3.4Ghz and NVDIA GTS 250 1G, Sata drives) and in the past I had to convert to dnxhd proxy. Is it still the same process? Also if I am using a generic ICC file for my wide gamut screen that was offered in Ubuntu studio. Should I switch to sRGB profile since final product will be streamed in Vimeo and YouTube? Thankyou Tanya