No problem.
Why SuSE? I was about to suggest SuSE too but I can't say I'm a huge fan of the direction Novell has taken over the last 2-3 years but to each his own
And RedHat Enterprise Linux is more tailored for a server environment though it will still function well as a Desktop. But Ubuntu, in my opinion, is by far the best for a desktop distro even surpassing SuSE.
The main issue with dual booting is having a boot loader that understands what's going on with your MBR.
If you install Ubuntu on a PC that has Windows already on it, Ubuntu will configure GRUB for you so that you don't even have to mess with the GRUB config files.
If you want to install Windows on a PC that contains a Linux, you will probably have to edit some grub config files since the MS boot loader will no doubt overwrite the MBR without concern for any other boot loader that should be allowed to exist since this should ultimately be your choice.
see:
Ubuntu: Dual boot with Windows
NOTE: Current Ubuntu version is 8.10. The next Ubuntu release comes out in 4 days (April 23rd, 2009) and it will be version 9.04. If I were you, I would go with 8.10 and wait for about 2 months and THEN install 9.04 along with updates and patches to ensure your system is bug free.