I've stuck to Sandisk as far as my SD cards but tried a Lexar CF when I got my 7d2. Both are pretty well regarded so you just need to make sure you get legit cards (avoid Ebay and unknown market sellers on that rainforest site).
No point skimping on price here since you don't want cards dying on you or corrupting files etc.
No point skimping on price here since you don't want cards dying on you or corrupting files etc.