Registering for gifts and would really like to get some Riedel glasses. But, it seems they only have glasses that are made for specific varietels. Due to space limitations, I an only get one typre of glass for whiet and one for red. Should I get one Riedel made for a red and one made for a white, and if so, which would be closest to an all purpose glass geared for all varietals. Or, is there some other brand that I should be looking at? Thanks all.