I agree with Dana. If you can afford it the smiley face OPK's are by far the best. It can sometimes drive a woman batty to try to decipher the lines on regular OPK's, but with the smiley there is no question. That is also what my RE recommened.
Some of the ladies here buy the cheapy internet ones (especially those with longer cycles) and then use the digis as back up to confirm when they think they have a +.
I'm also a strong believer in temping, so if there is anything you want to know, just ask!
Best of luck to you and SSBD!!
Good luck to you! I would spring for the digital smiley OPKs by Clear Blue Easy. You can get them on the internet but I'm not sure it would save you any money. They can be found at most drug stores and they aren't cheap but here in the US we have Walgreens and I got them on sale there once. I used the test sticks for awhile but I found them to be inconvenient and i never had any luck really discovering if I ever got a TRUE positive on them. The digital ones I used and I got my BFP the first time I used them (mind you this was almost a year trying so I'm not sure what did it...lol) Anyway..it is reassuring to see the smiley face so you know for sure you O'ed. Again, good luck!!!