A star Alliance award North America - Europe using Krisflyer miles is 95,000 round trip so the OP should be home and dry..

Remember the mantra..
Earn in Economy & burn in Business
Mileage redemptions in premium cabins is always much more bang for your buck than economy. Ie mileage increase is usually 50-100% whereas cost increase for a paid ticket is usually 200-500% depending on the route. Upgrade awards are usually a bad deal as its only the higher priced fare buckets that are eligible for upgrade..