chain and sprockets on ebay

[Nelsonmd]

So I need to replace my front sprocket, and I figure I should at least look into replacing both sprockets and chain at the same time. I couldn't find any posts here or on the old site talking about different brand/kit options, so what are your opinions the these:

$138
http://www.ebay.com/itm/YAMAHA-XJ600-SE ... 412wt_1163

$88
http://www.ebay.com/itm/Yamaha-XJ-600-S ... 731wt_1163

$67
http://www.ebay.com/itm/Standard-Chain- ... 332wt_1163

Any other considerations I am missing, please let me know. I am thinking I would like to try going 17-48 or 16-46 if I can, otherwise just stay stock. So not regarding the tooth counts on these specific links, what are your thoughts on the quality, etc.