That's quite a challenge you've set there, most curry venues in Manc aren't great.
I'd be tempted with 1 of these :
Rajdoot on Albert Square- I've never been but hear it's nice and they have an Egon Ronay plaque outside IIRC
Sangam in Rusholme. It's an unlicensed restaurant and they have a sweet centre / takeaway next door. The interior's nice and it has a very asian feel to it, if you know what I mean …asian families & couples and no drunken crowds!
The Punjab in Rusholme (further up from Sangam but on the same side, LHS going away from town) – they have south Indian food, really nice dosas. The interior isn't as nice as Sangaam but the menu is pretty good – the Papri Chat or Bel Puri starters are lovely!
I also seem to remember somewhere called Shimla Pink's down off Deansgate, Salford side. They were deffo trying fine-dining curry style but I thought it was overrated.
Hope that helps.