Introduction
Choosing Reliable Parts Not Flashy Looks
The most important thing is to go with a brand that upholds their warranty and is reputable enough. Don't go for anything with LEDs or flashy looks, This component is all about the internals and reliability. Save the desire for flashiness or stand-out looks for your GPU, Motherboard and other stuff. Now for a trustworthy brand I recommend Thermaltake because I had an issue with one of their PSUs that I bought at best buy and they gave me a brand new one so they definitely uphold their warranty.
To go Modular or Not to go Modular
There's plenty of ways you can do this, You can select a thermaltake PSU that's completely modular so that you can pick and choose what you connectors you need rather than worry about doing a lot of cable management. That would be very useful for a Mini-iTX build because the size of the case which are very small especially the Silverstone Raven. If you have a bigger case for something like an ATX build than you could probably go non-modular or semi-modular.Conclusion
Now lastly you could do some creative things with the cables of your power supply but that's another subject for another time because you got to be careful how you approach that and there's a lot of explaining. There's multiple avenues but regardless of which one you take, you got to proceed carefully otherwise you'll get stuck in a trip-mine and waste your money or worse your hardware. Hopefully this helps you out on your way to getting the right power supply.