I am looking into buying a new satellite. My current setup is RBK50 (Router RBR50 + 1 Satellite RBS50). Currently thinking about these three options:

1. Buy RBS50 which is expensive but very powerful: $215 now on Amazon (RBS50).
2. Buy RBS40V which is way cheaper but less powerful: $99 now on Amazon (RBS40V).
3. Buy RBW30 which I am not sure about its performance: $149 now on Amazon (RBW30).

The room I want to install the new satellite in is very close but for some reason, the signal is weak (concrete walls). I tried the current Satellite (RBS50) I have and it worked perfectly so not sure how RBS40V or RBW30 would perform. Any advice?