I put in an order a few days ago for a Toshiba laptop - specs below - and plan to scrub it clean of it's preinstalled Windows infestation in favor of the latest version of xubuntu (12.10, if I recall properly). Since I'm using 12.04 right now (didn't upgrade because I was getting new hardware soon to replace this nearly unusable machine), I was wondering what advice you would offer for configuring this new machine.

1) What would you recommend for the swap partition (if any)?
2) How would you get NVIDIA's Optimus tech to work...or would you bypass it via BIOS?
3) How large of a root partition would you recommend (going to have a /home partition taking most of the drivespace)?
4) Would you recommend using RAID-1 for this configuration, and if #1's answer is greater than zero, RAID-0 for the swap partition for added performance when I do use it?

Tech specs:
Toshiba Satellite P870-BT3G22 Laptop

Intel®  Core™ i7-3630QM Processor (6M Cache, up to 3.40 GHz) with Intel® Turbo  Boost Technology
Windows 8
8GB DDR3 1600MHz (4GB + 4GB)
500GB HDD  (5400rpm, Serial-ATA)
500GB 2nd HDD (5400rpm, Serial-ATA)
2GB GDDR3  NVIDIA® GeForce® GT 630M with NVIDIA® Optimus™ Technology
DVD  SuperMulti drive
Glossy Black LED Backlit Tile keyboard
17.3" diagonal widescreen HD+ (1600x900) TruBrite® LED Backlit display
WiFi® Wireless networking (802.11b/g/n) with Bluetooth® version 4.0
Microsoft® Office (trial)
Norton™ Internet Security 2013 (30-day trial  subscription)
1 Year Standard Limited Warranty (1 Year on Battery)
3 Year SquareTrade Accidental Damage Service + 2nd/3rd Year Extended Service Plan (1 Year on Battery)
Thank you in advance for any help you can offer me. Been using ubuntu since Hardy Heron and xubuntu since Unity, but it's always best to get advice from others who have been using the OS longer. ^.^

- A