Performance varies according to what kind of tests you run and what use case and scenario you have, as well as your daily use.
You shouldn't have any trouble with either case at all, seeing as they have the PSU in a separate chamber from the motherboard and all you have to do is pull the necessary cables through to where they need to go. There's more than enough room to tie up loose ends and have a clean-looking system even with a non-modular power supply. When you said V750, were you talking about
this model? That's a good power supply, but the price is high at the moment. If you look at the price tracker, it has dropped to $100 CAD in the past, so $130 isn't a good price.
If you're looking for a good 750 watt power supply at a lower price, then let me recommend you my usual go-to choice: the
EVGA Supernova B2 750 watt model ($75 after $30 rebate). It's semi-modular and of comparable quality to the Cooler Master V750 you were looking at and costs about $50 less if you include the rebate. Otherwise it's only about $20 cheaper.
You can compare the two power supplies here by the same review website. Jonny Guru gave the
EVGA model a 9.0 rating while the
Cooler Master model scored a 9.4 rating.
Otherwise if you're looking for gold efficiency and
fully modular cabling, you can get the
Antec EDG-750 ($125 after $30 rebate) for a few dollars less than the Cooler Master V750.
HardOCP's review of the Antec was very positive, and
they did note that the unit was impressively quiet.
They would be faster, there's no doubt about that. I think he just means you wouldn't really notice it so M.2 drives are needlessly expensive unless you're going for a super compact build. SATA3 SSDs already are capable of loading things very fast, so you're essentially paying a price premium for something that does the same thing but shaves off only a few seconds here and there.