If you are looking to find a tax/Chapter 13 attorney in your community, may I suggest using the "Find a Lawyer" search feature here on Avvo.
Based on what you are describing, the think Chapter 13 could be a very effective way to manage the repayment of your IRS lien, but my one concern is that you might be over the debt limit of Chapter 13, which is $360,476 for unsecured debts & $1,081,400 for secured debts.
Hope this perspective helps!
You ask whether a Chapter 13 reorganization can help you keep your practice, as well as keeping the IRS (and presumably Illinois Dept. of Revenue) at bay. Your question also asks if you qualify to file Chapter 7 liquidation. The answer in both cases is "maybe." Why not a definite yes or no? Because the facts of your situation will make the difference. These considerations include how much of your debt is secured, how many people live in your household, whether others in your household make an income, and if so how much, whether your practice is organized or operates as a sole proprietor, etc. Feel free to contact us for a consultation in which to discuss your case in more detail. I look forward to speaking with you.
Your best bet is to get a consultation with a bankrutpcy attorney in your local area. They can interatively answer your questions by asking other pertinent facts. Most BK attorneys provide free one hour consultation.