My house beer is a Kolsch.
As you'll note with different recepies, there is very little difference between a Blonde Ale and a Kolsch - the yeast is what seperated them.
For my house beer (which I've always got on Tap), the Base is Pale Malt (85% of Grain Bill), and I add Wheat Malt (10%) for golden colour and taste, Carmalized Malts (5%) for Head Retention and Mouthfeel - I use a Dextrine or Carmel, or whatever I have on-hand.
This Means that you can use DME or Extract and steep the Wheat Malt and Carmalts, to get the best of the flavours.
For Hops I never use overn an onunce (for a 5gal/19L Batch) spread into 3 or four parts every 15 minutes - I've tried different ways, and it doen't make a difference.
As for the yeast... I've used a California Ale, Kolsch and German Ale, with the best result being the Kolsch.
Happy Brewing!