Racing seats are much heavier than required. One of the reasons is that if you are making your turns coordinated, then you do not need the side bolsters the racing seats provide.
Having raced for 10 years, racing buckets are also VERY restrictive and I would not want to sit in one for a LONG cross country.
What I did give serious consideration to was installing 3" race belts rather than the 2" aviation belts. In the end, I went with 2" belts and haven't worried about it.