It really depends on your needs. Check out Progressive Dynamics as well as Xantrex.
I would recommend a pure sine wave inverter (vs modified sine wave).
The converter charge portion should be sized to the battery bank and include a multi stage charge routine to keep from boiling the battery once charged.
100 amps max should be ok for a 6- 6v bank system.
Combining the inverter and converter processes into 1 unit is not as modular as separate units when it comes to repairs flexibility but may save you a few bucks investment.
Our coach has a Progressive Dynamics pd9180 80 amp converter with charge wizard ($220) and a Xantrex ProWatt PSW 2k inverter ($320) tied to 4 6v batts, for reference.
80 Amps Inteli-Power PD9180 Power Converter - $197.90
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