Iím going to install Leopard 10.5.6 (iPC distro) onto my Lenovo ThinkPad R400.
Please find my hardware specs in my signature.

Which extensions/patch should I choose during the installation?

Thanks a lot,

Lenovo ThinkPad R400
CPU: Intel Core2 Due P8400 @ 2.26 GHz
Chipset: Intel ICH9M-E/M SATA AHCI Controller
Video: Mobile Intel GMA 4500MHD
Audio: Conexant High Definition SmartAudio 221
Mouse: Lenovo Thinkpad UltraNav Pointing Device (plugged into PS/2 mouse port)
Keyboard: Standard PS/2 keyboard
Bluetooth: Broadcomm ThinkPad Bluetooth 2.1 with EDR
Network: Intel 82567LM Gigabit Network Connextion
WiFi: Intel WiFi Link 5100 AGN