well, i am planning to do the same. my basement doesnt ever flood. it just gets damp. i believe you should be able to find the correct drain pipe at any good local 'supply' dealer.
what you want in the trench next to the house is pvc-type drainage pipe that is solid and has pre-drilled holes in it.
If you go to a building supply company they will know exactly what to use for the drain line.
for a good treatment o your exterior walls you might as well do it the right way. 1) paint your foundation with a concrete mastic product. 2)cover that with asphalt roofing cement. 3) apply plastic sheeting to the still gooey asphalt. 4) get those sheets of hard thin green insulation sheathing from the hardware dealer and place next to plastic. 5) backfill 6 inches of reg. gravel next to foundation. 6) lay pipe. 7) cover with 1.5 feet gravel. 8) cover gravel with plastic mesh screening to keep gravel from being infiltrated by soil. 9) backfill soil. done.