"If you wanna go faster, be lighter."
Unless, your using the Cross-Check to race, I wouldn't worry about how light it can get. Just put on components you trust or love. It's always about the love, never not about the love.
"Things look different from the seat of a bike carrying a sleeping bag with a cold beer tucked inside." ~Jim Malusa
2009 Trek 520-Brooks B-17 Special in Antique Brown
2010 Surly Long Haul Trucker-Brooks B-17 Standard in Black
1983 Fuji Espree Single Speed-Brooks B17 British Racing Green