I was reading the owners manual in my LR3, and nowhere does it say I have to put synthetic in. So I'm running just normal castrol dyno oil. I'll change mine out every 3k. It isn't a DD, so that really equates to 2x a year (assuming I don't do a big cross country trip with it). Also looking at the vehicle history, I don't see anywhere they've ever used synthetic. So if it hasn't had it, ain't gonna get it.
Mann filters are the way to go. Rock auto has them for reasonable. Also get your cabin and air filter there. I've heard really good things about Wix filters as well. Wix is owned by Mann, so I bet its all about the same.
Moving forward, I'll probably get my filters from LR Direct when I do an order. About half the price from there vs. here for Mann filters.