4.7l v8, 45rfe : Underpowered, overpriced.
6.1 hemi (ouch!) waaaayy overpriced for what you get. You can get the same power from an 6.0 chevy with an LS6 cam and intake for half the cost.
or a v8 with 2 extra cylinders and a 48re: Heavy, crappy gearing in trans, ~ same HP than a 5.3. You don't need torque, you need HP. My 4 cyl make enough torque, its HP we all need for wheelspeed. (I own one of these funny V8 +2s with a shitty 48RE..)
5.3s make ~ 300 hp, are available in Aluminum blocks (iron blocks are basically the same weight as a 4.0, the Aluminum block versions are about 80lbs LIGHTER than a 4.0 boat anchor). Iron blocks are available for about $700 all over the place, Aluminums are more like $2k. 4L60es are cheap and easy to swap in.
Gen III GM V8s have better reliability than any of those others.