go with 5224,it is more stable than 5232,and you gain nothnig with faster model,only lose,i have a 5224 myself,and am pretty satisfied .
it is not my scsi,but does the job.
it is noisy i must say,like an airplane while reading,so i slowed it down with nero's tool.
but it has a strange writing results on different media,somehow i get the impression he does not like what i serve him,and believe me i do try to satisfy him with various media.
You will see however that people who have 5232 are not satisfied at all,majority of posts prove that,and for that 8 bucks,well get two buregers and burn safely with 5224.