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I also heard the players at FTP are a lot more solid than the players at pokerstars.
This isn't really true; they are both big sites with higher standards. On the other hand, don't you want less solid players?
I personally prefer Stars as I might probably get supernova status by next year, which should cover the rakeback aspect anyway.
400 is a bit risky, but as long as you are disciplined enough to move down when you get past that certain mark (I'd conser 300 for 30 BI at 10NL), it shouldn't be too terrible, and may in fact work out great for you.