for the ASA5510 you only have a few options, the
ASA-SSM-AIP-10-K9 will work fine unless you need more thruput (the sensor throuput is less than the host ASA) then you should go to a AIP-SSM 20. (part numbers in here)
Security Plus is a ASA firewall feature set, and has nothing to do with the IPS functionality. You will be purchasing an annual license for the IPS sensor, that will give you the full functionality of the unit.
Reports can be created off the management platform. If your customer has 5 or less IPS sensors, they can use the free IME.
You can't generate syslog from the IPS sensors. You can use the native SDEE to send events to IME or anything else that can process SDEE feeds. Alternately you can option each signature to generate an SMP trap (but that is more work).