Ford Excursion :: A/C Shaft Seal Leaking?

Well, the ac in my truck has been less than exciting since I've owned it and its time to address it before another trip.

I crawled under last night to explore the Ac clutch air gap and found that the shaft seal is leaking and clutch is grooved pretty bad and covered in oil.

I'm thinking it's time for a compressor, clutch, orifice tube, expansion valve and reciever/dryer. Does that about sum it up? I haven't messed with AC systems much outside of my simple jeep system that was as easy as two seals and recharge in my garage to fix it.

Do I need to flush the lines out? Should I do that at all? Motor craft worth the cost over something like four seasons? Its almost twice the cost but in the end if something goes I'm further downstream after freon etc to charge it and the possible shop charge if I pay to have to done.