I can't comment on the recipe, not sure what you are shooting for. I guess my only comment there would be, that's a lot of Crystal malt. But with a new kettle, keep in mind a few things:
You can still boil over a 5g batch in a 10g kettle. Easily.
You will want to keep an eye on your boil rate and your volume. With my particular setup, I shoot for 6.75-7.25 gallons pre-boil for a 5g batch, but this is very dependent on your kettle, boil rate, outside temp, etc.
If you don't have a sight tube, spend 30 minutes and make a dip stick for the new kettle with 1/2 gallon increments or better. You will be able to use this tool a lot in subsequent brews to mark your boil progress and adjust as necessary.