I have a Mossberg 590 pump right now, but I'm interested in going with an autoloader.

Been looking at the following:

FN SLP
Mossberg 930 SPX
Benelli (M1 or M4)

Everyone I talk to goes Benelli crazy, but I don't really want to drop $1600 on an M4 and then still have to add a tube extension to get to a round capacity I'd like.

Any suggestions/opinions on the above weapons, or any alternatives to these?

Thanks much -