Between Ashton, Heskey and Owen for me. Ashton would be an incredible player for us, if fit, and I'm not sure even we could keep him fully fit. Same is true of Owen and I'm unsure how well he could work with Gabby, who I don't think is realistically benchable these days, though I do think Owen would be a great striker to have as well. Heskey isn't glamourous and would piss an awful lot of people off, but he's a good striker to work off for Gabby, wouldn't be too expensive, would be capable of doing Carews job when he's injured, and is benchable I suppose. Doesn't score too many himself and would not fulfill the hopes of anyone expecting the very best.
Purely because I think he's the most realistic one, Heskey. Though any of em wouldn't piss me off too much.