Er, what bike will you be using the fork with? Reynolds has a good reputation. True Temper Alpha Q forks are very good too. Advanced composites Wound-Up are nice too.

Reynolds forks: 372mm crown to axle length, 1"-1 1/8" steerers, 37.5mm - 50mm rake

True Temper: 374mm crown to axle length, 1" - 1 1/8" steerers, 38mm - 50mm rake

Advanced Comp: 366mm crown to axle length, 1" - 1 1/8" steerers, 35mm - 48mm rake

Measure your current fork for both length and rake. Figure out your head tube angle. Use this site to figure out trail.

Read this page to understand the effects of switching out your current fork with a carbon fork.

Pick one of the above forks that doesn't affect steering in a negative way.

Personally, I use TT Alpha Q forks. Love 'em.