design a simple Database management program program for a Coffee shop

I have a Coffee shop in Seattle and have an ever growing customer base. We have a rewards program that gives a free drink to a customer after they purchase 10 drinks. We are using index cards right now and it is a GIANT pain in the ass to fumble through a stack of index cards just to put a checkmark (or the date) into a box to keep track of there purchases while the line is building up.. AND we typically do not know that they are due a free drink until we pull there card which typically happens after the purchase.. I use my IPhone contact list as an example of what Im looking for. Im looking for a simple * Touch Screen software program that Is Very similiar to the IPhones contact list where I can scroll with my finger down to the name Im looking for... Select that name,.. bring up there "File" and add the quick "1 touch" piece of info. that indicates the purchase and then move on with the next sale. I would like a few different fields for notes or whatever on each file but the main thing is to easily and quickly scroll to the name and Easily and Quickly add a 1 touch checkmark. I like the idea of the IPhone having the alphabet on the side so i can quickly page down to the correct letter and then scroll from there rather than having to take the extra time to scroll from the A's to the Z's. I would also like a limited "Customer only screen" that allows customers within the shop to check there account at any time before or after the sale to check there progress or any info. from any field WE deem important for them to see. Obviously the "Customer Only screen " would have very limited Data base access.. Also. from that "Customer only screen" we would like to let the customer have the ability to add a new account for there initial sign up. and thats about it.. It would be nice to have some very basic information Management and review tools. Daily sales figures etc.. It would be nice to have the potential to add a card reader down the road. We are open to any ideas from the Designer as to the best way to achieve this ability so feel free to suggest your ideas. We would like the following - written in "'PHP" . - PC Windows based. - Touch screen If there is an existing piece of Software available on the market "Over the counter" that can achieve this then please let me know and I will certainly compensate you for your time and effort in directing me to the correct product. Or, If there is an existing (OTC) product available that can be customized or tweaked or simply have a new template written for than that would work also. Thank you for reading this and i look forward to working with you Mark