i think it makes a ton of sense to have a hard lh and hard rh starter just to use in certain parks.......
and if you're smart, 1 or 2 of your starters will be S/R, that way you can only use 3 or maybe 4 relievers...which will help your pen if you have a good pen
heres a staff im using right now...playing in miller park..against 2 sheas and a petco in my div...and a cpl other sheas and yankee stadiums in th eleague..
sheets,n robertson,beuhrle,eaton....
cliff lee...jimmy serraeno....
then mahay,j rincon,nathan... and fulz as extra lh in the pen...
seesmt o be working out for me....