first add-on

there are 3 style of water pump that you could use
first generation with hydraulic tensionner AKA the Caravan style pump
first generation with mechanical tensionner nothing special that's the one I used
a new water pump was introduced with the turbocharged engine it has a superior flow and the impeller is different if I would do it again I would take that on

about the accesories
alternator you could reuse your own bracket the upper bracket bolts on the 2.4 engine and you cut in half the lower bracket to make it fit on the only available bolt hole on the lower portion of the block you will need longer bolts and washers to install and get the right alignment of the alternator and crank pulleys

power steering belt
shoeby found a belt just long enought to use it without the need of a tensionner
if you want a tensionner you could buy the srt-4 ac bracket and srt-4 belt tensionner which bolts on the ac bracket
someone on 2GNT used it without an ac compressor he drilled a hole so he could move the tensionner a little and used it with the power steering only
the avenger/sebring ac compressor doesn't fit on the srt-4 ac bracket at all I will use a srt-4 ac compressor in my car fitted with the avenger/sebring clutch and a shim plate to align everything

Alain

one of the 2.4 true pionners