I am looking to buy a new hair straightener but I want to buy a good one to last me a while. My hair isn't to difficult to straighten but it is also not so easy and it doesn't stay straight it waves a little after a while.

ghds if you can afford that much they between £60- £ 100 or remington are a good buy .
my mum is portuguese  and has really curly hair and both are great on her hair although i do suggest using a heat  protector as curly hair will dry and curl in any humid areas as u may no good luck x x x x  x x

I would recommend the chi straigtener. I bought the generic one at Sallys Beauty Supply for 50.00 and it works great! They also come in pink which I love!

Hands down, you need to get a CHI. You pay a little more upfront but it is worth every penny! Plus it won't burn out and there are no heat settings. It is just HOT. I have one and I absolutely love it.

You want to get a ceramic plated flat iron!  That will give you the best straightening and it will last the longest!  One good iron is the Heatmaster Professional Ceramic which sells for $29.99
specifics:

• Ceramic Heaters generate instant heat and instant recovery - up to 430 degreesF.
• Ceramic Plates Generate Far Infrared Heat to straighten hair from the inside out
• Negative Ions improve condition and shine
• Adjustable Temperature Dial for customized heat
• 9-ft. Professional swivel cord

The Heatmaster Professional Ceramic Flat Iron will smooth out hair and maintain that healthy shine even after styling. You get instant heat and your hair is conditioned and silky smooth to the touch.

There is also the Jilbere de Paris Ceramic tools that sells for $39.99
specifics:

• Ultra-smooth curved plate causes less stress and damage to hair
• Ceramic Pulse System with 200 watts of power
• 30 heat settings, up to 230 C. /446 F.
• Instant heat, even heat distribution, no hot spots
• Cool Touch Fabric

Jilbere Ceramic Tools Porcelain Series Professional Flat Irons feature porcelain plates. Porcelain is a fine ceramic compound with greater strength and durability for precise heat distribution and state-of-the-art performance. The "diamond hard" surface allows the hair to gently glide through the plates, preventing snagging and breakage. When introduced to heat, the porcelain ceramic emits far infrared heat waves, which have longer wavelengths. Heat at this level is more easily absorbed by the hair, resulting in enhanced vitality, reduced stress, and healthier hair.

There is also the Plugged In Tourmaline that sells for $39.99
specifics:

• Professional model
• Moist ceramic heat with ceramic plates
• Quick-heat ceramic heaters
• Heats up to 420ºF
• Ceramic will maintain even temperature all the time
• Ceramic seals the cuticle and gives even heat distribution
• Repels humidity and locks in hair color and resists fading
• Latest ionic, ceramic tourmaline technology for smooth silky hair

Get bedazzled with the Limited Edition Plugged In Pink Gem Tourmaline Flat Iron. This limited iron features the latest ionic, ceramic tourmaline technology for sexy silky smooth hair. Far infrared heat styles hair from the inside out leaving hair softer, stronger and healthier-looking. Tourmaline is crushed then infused into plates to produce negative ions which restore moisture balance. Accelerated ionic properties style hair even faster while adding more luster and shine. Ceramic plates produce far infrared heat to style and dry hair from the inside out. Sparkling gems let you style in style!