LP to natural gas

Am going to be converting from LP to natural gas. The water heater will need to be replaced since it can't be converted. I'm looking for opinions on what brand water heater to use. Also, thoughts on buying one from one of the big box stores.
Thanks,

A quick search will answer this off-posed question. Basically, Rheem and Bradford-White seem to get the support from the pros, but search and read in more detail. An extended warranty is an insurance policy, not a guarantee of a longer lasting tank. The fancy dip tubes are a marketing scheme, and not something to sway you towards one version verses another.

Look at the Rheem Power Vent models.