What is interesting about block homes is that they are stronger and resist bug problems. Take a look at this post: http://www.trulia.com/voices/Quality_of_Life/What_problems_m
Brick homes are worth more than wood homes. So I'm sure that this confuses you since you feel your home would be a step higher than brick. But as JR asked in your last question, "What is a block home?", you can see that you need to educate the buyer as to the advantages because your home is unique.
Here is my advice. If you can't afford to put stucco on your home to make it more attractive, try a FUN advertising campaign. Sell your house using the 3 pigs with a stick, straw and block home. Make sure people know that they are getting something solid that will last - especially if you are in a hurricane zone.
I have a client who turned her "ugly duckling" into the cutest house and has people knock on her door weekly asking her if she wants to sell. What did she do? She covered the block with a stucco or stocco like product. The contractors covered the grout lines and the entire house with an even coat. Then she had it painted a cute color. She did the house with a Spanish influence and added rustic shutters, some cute post on the porch... and voila ... she had a House and Garden contender.
I don't think the objections to block houses are the "construction" method as much as the look. Get some magazines and books and try and find some curb appeal ideas that with distract from the "block" and make the house a "buy".
These potential problems coupled with the look can be a turn off. Try painting with two colors...one about 1 to 2 feet high around the house, and a lighter pastelle color for the balance.