Which flat iron/curling iron is better?

I want something that can straighten and curl. My hair is pretty thick and very curly and I wanted to make it have bigger waves instead of tight curls. I suppose I’ll have to straighten my hair before I can make it wavy, which is why I need something that does both.

I have been looking at two different straighteners/curlers: the Infiniti by Conair You Style and the Remington Sleek and Curl. Which is better? Or, can you suggest any others?

http://www.target.com/Infiniti-Conair-Style-Multi-Functional-Styling/dp/B001T0HHBK/ref=br_1_4?ie=UTF8&frombrowse=1&qid=1275098966&searchView=grid5&sr=1-4&node=13825631&searchRank=pmrank&searchPage=1&searchSize=30&id=Infiniti%20Conair%20Style%20Multi-Functional%20Styling&searchBinNameList=purchasing_channel%2Csubjectbin%2Ctarget_com_age%2Ctarget_com_gender-bin%2Ctarget_com_character-bin%2Cprice%2Ctarget_com_primary_color-bin%2Ctarget_com_size-bin%2Ctarget_com_brand-bin

http://www.target.com/Remington-Tourmaline-Titanium-Ceramic-Straightener/dp/B001DEYOD6/ref=sr_1_1?ie=UTF8&searchView=grid5&qid=1275099011&frombrowse=0&fromGsearch=true&node=1038576%7C1287991011&keywords=remington%20sleek%20and%20curl&searchSize=30&id=Remington%20Tourmaline%20Titanium%20Ceramic%20Straightener&searchBinNameList=purchasing_channel%2Csubjectbin%2Ctarget_com_age%2Ctarget_com_gender-bin%2Ctarget_com_character-bin%2Cprice%2Ctarget_com_primary_color-bin%2Ctarget_com_size-bin%2Ctarget_com_brand-bin&searchNodeID=1038576%7C1287991011&searchRank=target104545&sr=1-1&searchPage=1

Thank you so much!