Problem is a prime starter will cost you a lot more than Kilome, as will a top RP (we have plenty of Hunter types) and what bat is worth adding with Williams and Franco turning their seasons around (a big reason we're in 1st base in the first place).
I hate trading young pitchers, because pitchers will be injured so you'd better go 8-9 deep, including your AAA starters. Just look at the injuries we'd had the past few years, Morton, Buchholtz, Eickhoff, Leibrandt, etc. And veterans go belly up like Hellickson. You can always justify any one trade, it's the cumulative effect of hollowing out your farm system that kills you - imagine if they never make the Garcia for Gio and Floyd trade?