I wouldn't hesitate to buy suspension parts from eBay, as long as they are a good brand. I trust TRW for tie rods ends/ball joints. I don't know about "Chassis500 Brand" but the price looks good..actually pretty low. Suspension parts are something that you don't want to go cheap (quality) on. Afterall, TRW parts are not expensive compared to the lower quality ones.
If you're doing the struts too, I would also replace the ball joints. They are inexpensive also, and if yours are original (210,000?) I'd do it as the front will be torn apart anyway. They say "if it isn't broken don't fix it," but for $35 a piece, new ball joints vs 12 year-old ball joints are a good investment IMO.
You could inspect them first, but I'd personally just replace them.