If it's going direct from your TV you'll be looking for active speakers/sound bar, like the ones on most PCs which have an integrated amp. If you go for passive speakers then you'll need the full amp set up.
Personally I wouldn't go active if you're planning future upgrades. I'd go with components as you're getting yourself on the upgrade path, so you can replace components one at a time within a separates system, as your taste and budget allow. However, I'm certain there are some very capable sound bars out there if your not fussed about upgrading again in future.
Just check with the dude at Richer, they're usually very knowledgable and not pushy. Ultimately, it all comes down to budget. Just make sure you know what outputs you're getting from your sources, like optical or coaxial and make sure your chosen amplifier/active speaker can accommodate them all.