Thanks to all for your excellent responses full of good information.
To give you an idea of my plans:
Currently I have a Pansat 2500 connected 90cm dish with a standard linear LNB. This system was originally purchased so my Dutch wife could watch BVN on IA5 mostly to catch the sports highlights (studio sport and sportjournaal) as she loves sports (mostly football - the kind actually played with the feet

). Being an Engineer and thus by default a tech weenie it is in my genes to always upgrade/improve my toys. And of course I want to receive everything I can (legally - if I wanted DBS I would subscribe to it). My big interest is in sports feeds so everything I do is geared toward that.
First I added a motor so I could see almost the entire arc - found Goltv by accident (remember I have a STANDARD linear LNB so wouldn't really be looking at circularly polarized sats).
Next I slaved an old analog receiver I got off ebay (TRX-120) after reading about all the feeds Iceberg was always getting off SBS-6 and AMC-9.
As I was just in The Netherlands last week I picked up the universal LNB I had a relative purchase for me 2 months prior (Invacom single) so I could point my dish at PAS-9 Ku (and hopefully get something) - if I receive even one European sport feed off of this the points I will score with my wife will be astronomical and then I may be able to justify my biggest wish... C-BAND!!!
But this brings me to the whole reason for this thread. I am currently missing the ability to view the many 4:2:2 feeds that appear. So while in Europe I decided I had to get a receiver for this and the best and cheapest solution is a DVB card. I would have purchased a SkyStar 2 from the shop I visited but they were out of stock (I did drool over the QualiTV and Dreambox receivers on the shelf - amazing how much more mature the sat market is over there). Strangely the salesman claimed they weren't making the Skystar 2 anymore???? I'm not sure I believe him. The Technisat website seems very up to date and has it nicely featured.
Anyway, it seems that I can't go too wrong with a cheap card like the Twinhan 102g or the SkyStar 2. Since the Pansat already does the 4:2:0 well I would only use it for 4:2:2. Correct me if I'm wrong but all the <inexpensive> mpeg hardware decoders seem to only do 4:2:0? so I wouldn't need hardware decoders on board. The Twinhan seems easier to get over here so it may be that one. I won't go for ebay on the purchase as there seems to be some shady characters selling new receivers (i.e ~15$ but you pay 50$ shipping!!!!! what is that about?)
I will likely be slaving it to the Pansat and using the Pansat for all blind scanning and motor/LNB control. It seems easy to pick out 4:4:2 feeds with it - audio only with a blocky mess on the screen. How I also connect in the analog receiver is yet to be determined.
My first step will be the DVB card. I will get that working with the old PC hardware and video card. I expect there will be a lot of playing and learning required to get good performance out it. It would seem that there are lots of options on decoders to use - thanks to all of you for showing me some good options on that.
Second step will be a better video card so I can connect it up to my TV (60" HDTV) as I have no interest in watching on a small computer screen.
Third step will be to build a bigger/faster/stronger computer that is capable of decoding HD streams as there seem to more and more HD wild feeds appearing as well. My impressions are that I will need at least a p4 2.4 or 2.8 with a big cache and oodles of memory. Or maybe even faster.
and Beyond? More dishes!!!!
So thanks again to all for the advice and recommendations. You have helped me narrow down quite a few loose ends on what I need to do.