Do not tile up a wall and leave a 60 year old shower valve in there.
Grohe is pricey and difficult/expensive to repair, parts not always readily available. HansGrohe is inferior.
Delta is the most commonly mentioned favorite among plumbers . Moen, Price Pfister, American Standard are decent brands. All have fans and detractors.
The Delta R10000 universal rough in valve is great, and allows wide choice of trims in single handle pressure balanced, 2 handle pressure bal., or thermostatic type controls.
Consult the Tile Handbook by the North American Tile Council ( tileusa.com) and also the tile forum www.johnbridge.com for help with the tile work. Please note that the most important part of a shower tile job is the substrate. NO DRYWALL! Need moisture barrier, cement board, etc.