At the entry level, the Focusrite 2i2 is one of the best interfaces you can get for the money. At some point, you may want to upgrade from there, but it is not necessary right out of the gate and you can always sell the 2i2 when you're ready to get new kit. You're not likely to notice big differences between interfaces in the $100-$300 range. Mostly that range is explained by additional features like more inputs, etc but the basic hardware inside that processed the audio is the same across models. When you get into the $500+ and $1000+ range, at that point you become more concerned with the included preamps and other bits, or you just get a proper preamp and a mixing board instead of an "audio interface" in the traditional sense.
If you want a good but expensive unit, then the RME Babyface is highly regarded. Not cheap though.
To go a step further, you'd notice more of a difference spending another $100 and going higher grade on the mic than you would spending the extra $100 on the interface. Or spend it on acoustic foam, or a nice scissor arm, shock mount or other kit instead.