Tally Ho!
with those line outs you can use just about anything like:

ADA 2 Channel MicroTube 200w Power Amp Rack Mount NR
http://cgi.ebay.com/ADA-2-Channel-MicroT...1QQcmdZViewItem

I noticed some Pyle amps there too...they are tough as nails and if they have the same warrantee as their speakers once did (and I guess still do), you blow it up and all you do is pay for the shipping. no explanations needed.

Since you do have line outs you can also get a quality bass amp for cheap too which I think might be a great choice because they seem to be going for dirt cheap right now.Youll save big on the ship if you find one in your area.
Pete