US broker with excellent swap rates?

I tend to hold my trades between 2 weeks to a month. I typically trade JPY crosses and US crosses. Do you guys have any recommendation on good brokers with very good swap rates; not be charged excessively like MBT. I also typically trade $20-50 / pip. Thanks.

US broker = limited choice
Check out Oanda. I wouldn't rate their swaps as "very good", but not too bad.

Now with the currencies and the trade sizes you're using, you should definitely consider to switch to the futures market (GLOBEX). It's where you will have the best conditions on all aspects. You just have to understand how it works (not that difficult).