It also would depend on whether you were going to leave your valving stock or not. At 290# you will probably want to have around 6.6-7.0 on the rear and .48-.52 on the frt. depending on what your abilities and type of riding your doing. With this 97 Aluminum framed bike, set-up(oil height & valving) is going to be real important with these stiff rates.
PS....how are things in SD I'm originally from Brookings