I agree with Ron, if $150k is your total amount of funds to take care of an investment property with, don't put all of your money into the property as a down payment initially. You can always make additional prepayments along the way.
So you have the down payment, but the other parts of qualifying is if your debt-to-income ratio qualifies, which is the ratio of your total monthly payments (existing mortgage, credit card debt) vs. your gross monthly income. For investment properties you'll want to keep that ratio to 45% or below for your best chances of approval. Your credit score doesn't need to be perfect, but as investment properties are higher risk you'll also want to make sure your credit is in as good of shape as possible, I am sure after you pay off half of your credit card debt you should see an increase in your scores (depending on how much debt, and your current utilization % on each card, it could be a big increase or small increase) but you may be OK qualifying without paying half/any of it down (OK debt ratio wise, and OK credit wise).
My recommendation is that the condos you should be looking at should be warrantable, meaning meeting Fannie Mae & Freddie Mac's financing guidelines, as it'll be a LOT easier to get mortgage financing than if they do not meet the guidelines. Examples of condo developments that would not meet guidelines are if they:
1. Have more than 15% of their dues at least one month delinquent
2. Are in a situation where the HOA/developer is part of litigation (minor matters can be acceptable)
3. Were a hotel/motel conversion
4. Have 20% or more of the total space is used for nonresidential purposes
5. Have one "entity" (person, company, developer, etc.) who owns more than 10% of the units in the project
6. Have timeshare or condo-tel/vacation ownership
I'd be happy to help if you still need it.