right now I have a 700R4, so my crawl ratio is...
3.06 x 1.96 x 4.56 = 27:1 (not including TC multiplication)
you have
2.48 x 1.96 x 5.13 = 25:1 (again, no TC)
Personally, I don't think I can get low enough with my current set up. Im gonna go to 5.13s soon... and will probably add some kind of crawler box too at a later date. I want lower gears for rocks tho... so your experience may differ. For most trail stuff my 700/205 combo is plenty but for rocks ya need more control.
j