CaptainBlueBear,
This is a decision that should be made solely by you. We cannot determine what your budget is and/or how financially stable you are.
1) Have you just joined the web hosting industry?
2) Do you have permanent plans for this industry?
3) How do you feel about WHMCS? Have you tested the software?
These are a few questions you should ask yourself. If you feel comfortable with WHMCS, and you have plans to continue in this type of industry, then in my opinion i would start with WHMCS (non-branded) with a monthly lease, until you see some sort of stability in your company and move forward within time to a owned license.
Layout a business plan for your company and follow it. Take a step by step. No one in this industry succeeded by taking the elevator.
Best Regards,