DI boxes are used in place of Audio Interface for certain application. For example, if you were recording into a device with a different impedance level. Hi-Z to Lo-Z. Generally, Audio Interfaces for PCs achieve the same effect as DI boxes, plus more. There's a great thread about DI and "reverse DI" on here somewhere.
It sounds to me that what you want to do (if this is possible with your amp) is crank it up, but use the line out so there's no sound coming out of the speakers, it's all coming out the back into your PC. Short of that, maybe your amp IS too big for the sort of thing you use it for. But before considering gear purchases, assess what you have and what you want out of it. A lot of gear purchases could be avoided if they're increasing the complexity of your situation.
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