Welcome to Ask Ubuntu! It is heartening to know that you are looking forward to give Ubuntu a try.
Is it worth installing Ubuntu to its own partition instead of using WUBI?
In my opinion, absolutely yes!
WUBI is a tool provided by Ubuntu community to enable a new user to take a glance at Ubuntu user Interface, its basic fuctionality etc. However, at the end of the day, it is only a tool running inside another operating system, using some of the host's features. To experience the power and ease of use in an Ubuntu system, it is recommended to go for a fully functional and independent Ubuntu installation, even if it has to be placed alongside any other operating system. I am sure you would love the experience of seeing Ubuntu in action on its own!
I understand that there could be some apprehension around the decision of disturbing an existing OS and partitions. Ubuntu installation process has been designed to give you a smooth experience during and even after installation. If you are a new Ubuntu user, it is recommened though, to go through the entire installation procedure of your chosen Ubuntu flavor carefully before starting. Even after that, if anything goes wrong, let me assure you, we at Ask Ubuntu are always ready to assist you with any problem you might face.
How to partition the disk to install Linux-Secure-Remix
Based on my experience with Ubuntu (and the fact that I am also relatively new to it), I will recommend the partitioning your hard drive as follows:
RECOVERY : Do not touch
OS : Do not touch
Resize with GParted to create free space at the end of the existing partition; at least 10 GB. You may do this operation from within Windows using any other partitioning software or by booting with Ubuntu LiveDVD or LiveUSB.
This free space can be used to create an ext3 or ext4 partition usable by a Linux system. This will serve as your Ubuntu partition.
Note : It will be a good idea to go through recommended partitioning scheme for Ubuntu before starting installation.
Wish you a great Ubuntu experience!