I would probably start out with one of the full-bike covers from Dowco--most likely, one from either their "Guardian" line or "Weatherall" products.
If you go with another brand, some things to include in the cover of your choice:
1) Flannel or other paneling to protect your bike's windshield (if you have one or will get one) from scratches;
2) Aluminized (or similar) panels to protect your cover from hot engine and/or exhaust pipes;
3) Reinforced grommets for a lockable cable, to keep your bike and cover more secure;
4) Last--but definitely not least--make sure the cover is VENTED--to let moisture escape.
Depending on the size of your bike's windshield and (hard) saddlebags, go with either a size large (L) or extra-large (XL). Stay away from the darker colors--avoid black and dark blue--and go instead with a more neutral color (greys, silvers).
Whatever brand you choose--most likely, what will kill your cover is exposure due to ultraviolet sunlight. One day, you'll go out to take your cover off, and as you pull up on it as normal, it will just tear, almost from its own weight, as this exposure will have weakened the fabric.
With this in mind, you might also compare cover warranties--and see what is/isn't covered, and for how long. Dowco covers may (or may not) currently have the best cover warranty in the industry. It's been a while since I've shopped for a cover.
If you plan on leaving your bike outside for extended periods of time, I would strongly encourage you to keep it waxed/polished, in addition to a quality cover. The cover will not really protect it from moisture in the air, which is the key catalyst for rust. If/when surface rust forms, you can usually take it off with either "Nevrdull" or (on chrome) with a piece of aluminum foil.
Do a forum search for "rust"--somewhere else here I did a post that tells where this bike is most prone to rust. Keep most of those locations covered with wax/polish, and your "baby" will stay much better looking over time.
You might wanna buy your first cover from a local shop, instead of over the internet. That way, if you don't like the way it fits your bike, you can simply take it back (assuming the shop will let you do this--ask about this, b4 buying--"what is your return policy on covers?"). If you do buy it online, go with somebody like Dennis Kirk, who may not have the cheapest price, but their return policy/customer service is second to none.
Seriously keeping your bike covered as it should be, is a true labor of love...but it is also a great deterrent to theft and/or vandalism. I wish you all the best....