Originally Posted by williumbillium
i would just buy a 130mm spaced frame then get a new axle for you rear hub and respace it to 130mm. problem solved. or you could take the lazy/more expensive route and buy a 8/9 speed wheel and use the 7 speed cassette on it with a spacer.
This is what I would do. For a cyclecross frame I would choose aluminum as it won't rust. With aluminum you can't coldset stays so I would pick 130 spacing.