^ What he said
Re your PSU, I just assumed it was being recycled from a previous build? I guess that's not accurate. I don't know anything about Lepa, but $140 for a 700 watt PSU is kinda high. It's yellow though! Sorry couldn't resist.
Yeah, I'm not a big proponent of "Gold" certified PSUs, really just because of the cost. And I'm not familiar with the insides of a Carbide 300, but do you want modular, semi or are you good with zip ties? Other than the brand and power rating, those two factors (certified rating and the modular option) will mostly determine the cost of a PSU. For a small form factor or in limited space, modular or semi-modular PSUs can be well worth ANY added cost. But it may be an unnecessary luxury if it's a relatively easy build with plenty of room, or if you are going to leave the insides all messy anyway, or if you plan to build it once and never open it again, or etc etc.
Here are a few suggestions:
- If you must have a Lepa, this LEPA B650-SA 650W
at $64 (after rebate) seems to have the basics you need - it's 80 plus bronze certified, but not modular.
- If you must have a Lepa Gold, this LEPA G Series G650-MAS 650W
at $85 (after rebate) is both gold and modular.
- Otherwise, this SeaSonic M12II 650 SS-650AM 650W
at $90 (after promo) is solid - bronze and semi-modular.
- Also, this SeaSonic S12II 620 Bronze 620W
at $68 (after promo) should suffice your build, too. It's bronze but not modular.
Lots of people consider Seasonic top of mind when it comes to PSUs. Imho, you can add, for the most part, Corsair, PC Power & Cooling, Cooler Master, Antec, OCZ, Enermax and maybe others. Some of the above may have a stinker or two, but they are generally strong brands. I think a few use re-badged Seasonics or parts from Seasonic or something like that.
Congrats on your decisions thus far!