I haven't tried to install Ubuntu in a while due to some frustrations during install previously. If memory serves I couldn't install it on to my ICH10R Raid5 boot array and I didn't want to give that up. So now I am getting the Ubuntu itch again.

here is my hardware:
Asus Maximus II Formula mobo
4GB G. Skill Ram
Intel Q6600 Quad Core
Soundblaster X-Fi Fatal1ty sound card
BFG Tech Nvidia 8800GTS-640 video card
2 Raid Arrays on the ICH10R SATA controller:
Array 1: Raid5 with 3 250Gig drives (this is my boot volume)
Array 2: Raid0 stripe with 2 500 gig drives for apps/games

So I downloaded the 64bit iso and attempted to install and very quickly ran in to a problem. The install is recognizing the array that has the bootable volume on it, but wants to erase the whole partition and use it all. On my laptop, it was able to install and share the partition with Windows 7. Any of you guys know whats up with this and maybe have some info that might help so I can get these running side by side in my Raid5 volume?

Just trying to make sure I am thinking everything through and prevent as much chance of a nightmare as I can.

So what do you all think?

Thanks in advance, I really appreciate your time.

You have to choose advanced in the installation setup to bring up more options. I would suggest you prepare the parition first with Gparted in live CD mode (or parted magic) and record the label, so when in the install process you know exactly the partition to target and format ONLY with unbuntu. If using grub already, I suggest loading the ubuntu grub to the same root partition (not the MBR) and update your existing grub manually with a new ubuntu entry.