The last IPA I brewed had just 2-row, munich, and vienna, and it came out damn tasty. I don't think you'd even need any crystal, just mash a little higher and use a nice english yeast that is going to leave a little behind and give off some tasty esters. If I remember right I used about 0.5lb of each the munich and vienna.
Both munich and vienna give off some toasty/bready flavors, and if I remember right munich is a little stronger than the vienna. However, its been a bit since I brewed that, so I would double check!