Agreed. Reaper is (IMO) the best free audio software. Well it is kinda free because they will tell you to buy it after a month, but, just like with WinRar, you can evaluate it forever. lmao!
Reaper does have a 64-bit engine and a great MIDI sequencer (the best for creating drum tracks imo). And it has tons of other really cool features. Actually, envelopes, exporting and navigation are the only things I don't like about Reaper.