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I can vouch for Focusrite - used a Scarlett 2i2 for years, and it was wonderfully simple to set up and use. @randythoades raises a very good point about your recording environment, though: if you're buying monitors, you could make your life harder if you don't also treat your room - ironically enough. A decent pair of headphones might be a better starting point...and when I say "decent," I don't necessarily mean "expensive." A pair of Sony MDR-ZX100 are cheap as chips, and they're surprisingly good while you're getting set up. (Studiospares also have some decent, flatter-response cans for when you're ready to upgrade.) To second randy's point about your amp: mic placement - not to mention mic quality - can be a real minefield. If you have lots of time to experiment, don't let me stop you, but if you're happy with Katana's USB output then you'll get better results, faster, that way. That said, if you're struggling with the tone, there are plenty of affordable amp sim pedals out there - Joyo do American Sound (Fender-like), British Sound (Marshall-like), AC Tone (Vox) and California Sound (Mesa), which are all knock-offs of the Tech21 Character pedals. Companies like Caline and Donner are making their own versions as well. Fun fact - I don't even own a "normal" guitar amp these days: I just plug one of those in when I want to lay down any electric guitar tracks.