Regarding lowering the front end - some info for you:
Unless you have an idea of what you are doing I would not recommend lowering the front end at all.
You should NEVER lower the front without lowering the rear. If you just lower the front, you unbalance the bike the wrong way. Many bikes can be lowered by approximately an inch in the front fairly easily by modifying or removing the stock preload spacer. Some bikes come with preload spacers that compress the fork springs an inch or more when the fork is unloaded. Shortening the spacer drops the front end of a bike an amount roughly equal to what you removed from the spacer. But be careful not to go beyond the point where there is minimal pressure on the spring when the suspension is fully extended. If you go beyond this point, your bike will be effectively springless when the front extends completely, as when the front wheel drops into a dip in the road at speed. Not a pretty scenario. In my experience, actually RAISING the front end along with raising the rear of the bike (via an adjustable shock) is a much better way to go, as this increases the ground clearance at both ends and depending on the amount the rear is raised, may also make the "turn in" require less effort.
Some of the common myths about lowering the front end are that it makes the bike turn in faster and loads the front wheel. The bike will not "turn in" any faster by lowering the front, it will turn in "easier", by requiring less effort at the bars to initiate counter steering.
Raising the rear has very similar effects to lowering the front, although as mentioned, it actually increases the ground clearance. Lowering the rear will increase the trail, and increase the effort required to turn the bike. Raising or lowering the rear will also affect traction on corner exit, as it will change the fulcrum point of the chain/swingarm pivot/rear axle relationship.
Typically (but not always, as it depends on several other factors in the geometry and suspension), lowering the rear will increase the bikes ability to "hook up" on corner exit, while raising the rear will increase the bikes tendancy to spin the tyre on corner exit (sometimes referred to as oversteering, although the term oversteering actually can be applied to several handling characteristics).
And heres the post i made about the GSXR project a while back: