Of course, our bench is not restricted...we can have as many pitchers as we want...your league might limit roster spots. We just have to start 1 each position plus DH, 5 SP, 2 RP w/ 23 man roster...so I usually fill my starters out and then load my bench up with cheap pitching. I had Jaime Garcia for a buck last year
Also, in my league you can add/drop at any time, no waivers, no cost to add/drop, no penalty. So it's a lot easier for me (with my league settings) to gamble on pitchers. I draft cheap SP, see what they do in the first few weeks, then adjust accordingly.
If your league is a waiver or limited add/drop league, then Halladay would be worht more to you because of lack of risk.