I'm starting to think the more I research, the more confused I get.... Looking at buying a few extras for my Canon 60D - a spare battery, 18-135, 70-300 and a few SD cards. Looking at a few options (where possible I'll be going through site sponsors since looking at this forum has already saved me hundreds/let me spend hundreds more..... thanks!!)

SD - easy, Cheap Chips - everybody raves about them - for good reason going by their site.

Lenses - few options here:
- Adorama (sponsor) look the goods IF refurbished lenses are "better" than greys. IMO all online "bargains" are to be considered grey, and I've read the pros and cons and understand them. They also have some new (grey?) lenses for not a lot more money ($10 or so at times, but not in original box or something minor)
- B&H, DWI, DIG REV, EBay - also similar good prices on new/grey lenses
- Simply Electronics/Citiwide - even better prices on some new/grey lenses

Delivery costs obvously make some savings evaporate. While there are many positive comments on site sponsors, and EBay can be a bit hit and miss, is there anything I should be worried about using sites such as citiwide etc? Regarding refurbished lenses, would I be right to assume they have been refurbished by the manufacturers themselves, or an authorised repairer so since they have been all inspected/fixed, they would be in the same, if not better shape than the new product.

Regarding warranty issues and returns - I'm hearing that a quality Canon lens will either be good to go straight out of the box (new) forever (assuming I look after them), or if there's a fault it would be noticed straight away. If something was faulty how would I go about returning it, and would that further evaporate any savings I may make?

Thanks in advance for any advice - you guys rock!