I've spent entirely too long in the last week or so researching this. You either go cheap but DIY, or expensive but prebuilt. That's not to say that a DIY is always cheaper than a prebuilt, you can go absolutely nuts if you want, but the performance and spec will always be better for the money going DIY. Hot swap drawers are over-rated as you'll maybe use them once a year if that. I can't recommend any specific prebuilt because I haven't used any and am waiting for parts for my DIY build.