Is Spyder the best choice? And if so, will their entry level suffice for me?
The Spyder's entry level offer is good enough for basic monitor calibration on a PC. I have one and it works perfectly. I installed an update on my new computer with Windows & and I can use the devise on both stations.
Remember that there are little difference in the hardware since you will be mostly paying for the software: if what you got is not enough (because you're adding a second screen or so) you can always update the software.
Do you print at home, or you are sending your pics to a photolab?