It is going to be very expensive to develop your own if Showcase doesn't fit you. I'd say it's cheaper to edit the templates of the RM and add in any extra features you want, if the RM is somewhat similar to what you want.
thanks guy, i try to search add on here and google, but most return abt classifieds or store ....
thanks you ... now i found that add on that i can mod to suit my need .