What kind of distance from the rear wall are you going to place your speakers?
Sealed box or front ported designs will work close to walls but rear ported wont. Ive a pair of PMC DB1i's that have a rear transmission line exit port, i had them either side of the fireplace about 2 feet from the rear wall but due to the alcove at either side of the fireplace it was impossible to get a smooth bass response.
Ive just replaced them with ATC SCM19's which are a sealed box and pushed the stands back due to the extra size of the new speakers. They are now a foot off the rear wall and produce a perfectly smooth bass response.
Maybe check out some used ATC SCM7's, although somebody may help confirm if your amp is upto the task of driving them. They recomend between 50 and 300watts. You'll find some for sale on the famous auction site at the moment.