There won't be any difference in the foil assemblies themselves, you might not get the '08 deck with the differnet graphics? If you are willing to spend the 2k, you can add the shock tower and still be very close to your price point with shipping. The shock tower will give you easier landings, however not really necessary unless you are dealing with back issues. The only other thing I might recommend is having the foil anodized so you are not having to polish the foil on a regular basis. I'm not sure where you are from or what kind of water you will be riding in, however some water will make the foil tarnish quicker than others. Either way, it's nice not having to mess with polishing the foil. When they tarnish, it does effect the ride somewhat. I think this can be added for around $150.00
Is this the group you joined? http://sports.groups.yahoo.com/group/Hydrofoil/
Also check out --> www.foilfreaks.com
Good luck and have fun!