Serpstat.com

As I said earlier I bought their ifetime special and don't regret it for second. For the price I'm having accurate position monitoring + great backlink tool + and one of the biggest Google US analytical tools. Compared to Semrush this has more liberties to experiment with keyword research. LSI keywords module and Missing Keywords tools are uber useful and help you fing ready and valable keywords to optimize website. It pull data from top 100 search results thus all of the keywords are already veryfied by top domains and you won't get gazillian results like you'd have from Ahrefs, but these would also be veryfied and "clean" keywords, and not trash results that you'd have to spend your time sorting out.

I had a complete bust on of my projects when all positions went awry. The issu persisted during few days and was resolved eventually. Hope it won't happen again.

As an all-in-one tool this certainly offers a lot of options to play with. I don't think I've explored of this tool's capabolities so I can only comment on their Search Analytics part. Which I genuinely think is a nice competitor research tool all in all.