I don't know how quiet that cheap preamp is going to be. Someone who knows about them might chime in.
I would discourage recording with a lap top unless it is the only way you can afford to put together a system. Lots of gear to carry around, not convenient to use, not possible to stealth with, etc.
If you can afford to, I would get an good inexpensive recorder like an iRiver H120 (only available used-sometimes available on this board for $100 or so), a Church Audio ST-9100 preamp and a Church Audio mic like the CA-11's or 14's (cost of a Church package around $300 shipped, but if patient you can find them cheaper in the yard sale here).
The above system will sound great, probably much better than a computer system with a cheap pre, and be much more portable and convenient to use.