chapter 13 bankruptcy

I filed for chapter 13 in jan 08. The reason being is that I hadnt paid my taxes for 8 years.
Of course the IRS caught up to me and I had to go back and file each years return. The principle was around 15000 but with late fees and penalties it grew to around 50000.
The IRS wanted around 700 a month but the interest would still be rolling....In the chap 13 interst stops acrueing.
Trouble is in a BK they take all "disposable income" They wanted 960 month.

I did it for almost a year but I have missed two payments and just like the guy in office spaces Im like.. I dont want to pay anymore.
I work in a restaurant job and sales are down 20% which means my pay is alot less than in previous years and I dont think its going to get better...rather its going to get worse.

Anyone here ever have to deal with a BK or get out of a chap 13? I cannot do a chap 7 because of Bush and I make over 45000 a year.

The only creditor of importance is the IRS, the others were under 2000 dollar credit cards...so they wont bother filing suit especially in the times we are in.