OK. Now that I know what you have and the budget, here's my suggestion. It will require you to save up some additional cash simply because good quality costs money.
First, you need an Audiophile 24/96 card for your PC. $150 I think.
Next, you need a Mytek ADC. $900
Then, you need a John Hardy M1. $950
Then, a Soundelux U195. $1000
Then, a set of Mackie monitors. $1200
Then, search online for freeware audio editiing software and plugs for reverbs and stuff. You can search the PC music forums here for "Best Free Plugins" and "best free software" See what you get.
Finally, You'll need gobos. These you can DIY for say $200 total cost. Search the studio building forum for how to make gobos otherwise known as broadband absorbers though not exactly the same.
This $4400 should get you into the right spot for making fine quality vocal recordings to match up to the pre recorded accompaniments.
If this is unacceptable and you must sacrifice quality for budget, go with the following;
Same audiophile 24/96 card.
FMR RNP for $475
Shure SM7b $350
Event TR6's $400
Same freeware app and pilug
Same gobos.
That's $1425. You decide.
