Another good option: Cobra CJIC 350
Can be had for as little as $80 + shipping on shopping.google.com.
Advantage over other models: Higher boost power, more traditional (i.e. smaller) footprint than power dome boxes
Disadvantages: Fewer power ports (only 1 AC, 1 DC), no true battery gauge (only vague LEDs), can't find details on cable gauge/length