if your using the words "hopefully" you'll still have your bike in a few years then you need to spend more money on locks. really just buy the top of the line lock. do you really want to regret paying for a lock? and really you should be buying 2 ulocks. what cost more a 64 dollar top of the line lock or a new front wheel, or rear wheel, or a whole new bike, or even an old used steel bike? the lock is cheaper. keep in mind a battery powered angle grinder can cut threw anything in a few minutes. those cable locks you can be cut threw with a pair of wire cutters or even household scissors.

64 dollars with free shipping and the best lock you can buy. and pair it with an new york ls, so you can lock to most racks/poles.
http://www.amazon.com/gp/product/B00...YDFP39Z8T87JMP
http://www.amazon.com/Kryptonite-Bic...6388637&sr=1-5

or consider the chain verson, so you can lock it up to anything and everything, and don't worry about the weight with a rear rack setup.
http://www.amazon.com/Kryptonite-Leg...388637&sr=1-17