How small do you want, and how loud do you want to go?
JBL 305s, KRK RP5 or RP7 will all run you less that $400.
JBL 308 will be $500 a pair, and give you a bit more volume and low end. Adam TV7s, Tannoy 802 Reveals, M-Audio BX8s will be similar prices. You won't be getting very loud for your guitar practicing, but they work fine for DAW work. Your guitar may or may not sound realistic depending on your Fx box (Strymon Iridium, Line 6, AxeFx or Kemper?)