Ah, if that's the case, then go for it! I dunno how much you know about carpets, but Bredli are awesome snakes that are a little different from the norm and enjoy climbing a bit more than some other species, and you could always look at diamond x coastal crosses. Will Bird produces some awesome natural diamond x coastal intergrades (meaning from regions that interbreed in the wild). Just as pretty as diamond x jungle crosses, and natural compared to man-made.
And my only other concern- I just want to make sure you know that carpets have the potential to grow FAST. If you're spending a ton of money on this cage (and it doesn't sound like you are), you could be in for a surprise with an animal that outgrows it in 2 years and you're looking for something else. Two of my bredli are only 2 years old, and are each over 6' long, with the female being closer to 7' than 6'. I didn't know they grew that fast until I got my first carpet (almost 9 years ago now? Wow, it doesn't seem like all that long ago . . .), and I was expecting something along the lines of a boa constrictor that would take 4 years or so to reach adult length.
One final thing- Did you post HerpFamily for a while? Your name seems familiar, and I keep thinking it's from there.