Polarising filter cracked - replace?

[philstanbridge]

I've been using a filter with a 12-24 on my Nikon D7000. Unfortunately it was dropped and cracked on holiday in Tunisia so I didn't get to use it. However, I haven't really noticed a huge difference in the kind of photos I take. Do they really make a big difference, particularly in bright conditions? I'm off to Turkey soon and I intend to take loads of photos. If so, can you recommend a reasonably priced replacement?

 

[philstanbridge]

Thanks very much for the in-depth replies. I've decided that I will invest in a replacement. I will be shooting a lot of outdoor stuff, with the potential for lots of glare. So can you recommend something? I've always been a little suspicious of filters. Apparently the one I had was £100 new (I got it secondhand along with the lens, which is Tokina)

 

[philstanbridge]

Thanks! That Marumi Super DHG looks nice. But still £70. Hmm.