Good DIY suggestions?

I am considering a DIY project. Looking for another way to enjoy this pastime and begin something new building an amp, speakers etc. Would love suggestions of good sites for purchase of these products/kits. Although a handy guy its been years since I've built anything electronic.

Some searches I've done have yielded less than stellar results. Figure many of you fine folk whose opinions have proven valuable and learned would have some great thoughts.

Best,