To go with the Train Engineer Revolution the best quality one is Phoenix PB11 (about £220....you might get an older 2K or PB9 version, second hand for about £120 to £175)
They come with many sounds programmed in for a specific loco ie one board will be for a single type of loco (but if you buy the Phoenix programmer you can load your own sounds from the Phoenix website). The sounds are for steam locos, chuff , blower, air pump, coal shovelling, dynamo, fireman Sam, brakes, coupler-clank, bell, horn etc. for diesels it is diesel engine notching, dynamic brakes, air pumps, horn bell.
There are other boards like 'Mylocosound' or Dallee, and even the LGB sound modules which will work with DC (analogue) power. They are perfectly fine, cheaper (a lot cheaper for the Mylocosound) but it depends on whether you are following an American theme, European or a British one as the bell and the horn on the Mylocosound is not good for American locos.
The LGB sound modules are for American or European and the sound are pretty good...close to the Phoenix but they are of a 'generic' type and do not have as many different sounds in each module as the PHoenix
As can be seen, a majority of the analogue sound boards are for american locos (Mylocosound could be British or European and the LGB ones are either American or European, Phoenix have a good spread of American or European sounds with one British (the Class 66 diesel), Dallee are nearly all American
You pays your money and you takes your choice
As has been said before, you could buy the Crest linear converter for your TE power supply and then find a DCC sound board as it will perfectly fine on DC power.