I have had Wilson boosters in the past, and they were excellent. One tip: get a directional exterior antenna, (Yagi/panel/LPDA) and take the time to map the signal strength by direction. It can make a big difference. Pointing the antenna at where you know the tower is doesn't always get you the best signal.
Basically, you get some gain on the antenna(s), loss on the cables, and gain on the amplifier, so try not to have long cables, and do separate the interior and exterior antennas so that you don't get feedback between them.
I hear good things about the Cel-Fi Go, but I haven't used it myself. The only downsides are cost, and that they are carrier specific.
All the best,
BG