[mike knight]

start with the basics. are you getting spark at the plugs? will the engine fire on a prime? if it fires on the prime then maybe you aren't getting fuel into the engine. i think you are correct that an engine that is cranking real slow may cause too much load on the battery and present as hard to start. i would still recommend checking that the plugs are firing.
my car has the battery in the trunk. i am running an engine management system, weldon electric fuel pump, electric water pump and an electric fan. i say all that to let you know i have above average electrical needs. my engine cranks and starts fine. even though it is fuel injected i have to allow the system to pressurize then it will turn over until the fuel gets to the engine.
good luck and keep in touch with the folks on this board, they will help you get it sorted out. huge amount of knowledge here.......and the guys who know these cars are really helpful!

mike