i've bought the shorty shocks from cycle x ($80) and found them to be sprung pretty stiff. prolly ok if you're over 250lbs, tho.
for that reason, i prefer lowering blocks and oem shocks.
the lowering blocks dropped the rear by 1 1/4inch. the 16inch rear tire adds another 1/2inch drop, for a total rear slam of 1 3/4inch.
i've dropped the triples 7/8inch (limited by the handlebars).
with the fatty out back and slammed suspension i expect turn-in to be little sluggish, and the jardine turn-outs will limit cornering clearance.