Yes I downloaded for over 200$ of music yesterday. And I got the No Doubt pack

I really wish there was more radio hits to download, seems like much of the DLC content is not mainstream. I decided not to download everything. I got maybe half the DLC now, I imported the RB1 songs into RB2 and downloaded the AC/DC Live pack into it as well. I think I have enough music now to have a good offering to start with.
Now I have to decide if I will get a second Starpex Obsidian guitar or if I will go for a warbeast. My major problem is that the Warbeast is not sold here in Canada, so if it breaks it will be complicated to have it repaired under warranty. The Starpex seems very sturdy, I think it would last longer than any other guitars for Rock Band available at this time.
For sound I was planning on using the bar's sound system which have speakers in every corner of the bar and also hook up a sound system so that I have have 2 speakers right in front of the stage to dampen the noise from the stage (drums mostly). This will require a lot of cabling.
I will listen to your advice and not to competitions to start with. If there is demand I can add it later. The no fail mode is something I had already decided to use

Don't want song after song to fail. It would make it very annoying to new people trying it out and would scare away the other ones.