Demus,
What you need to look for in a kit is the amount of must (grape juice) in liters, the more must, the less water you'll have to add, for example, most kits are designed to make 23 liters of finished product, the lower end kits will have 10 liters or so of must, you will have to add more than half of the volume in water to bring it to the correct amount.
The lower end kits are usually just that...low end, flabby, weak wine, you can buy a mid range kit and make a better product. Just be ready to age the wine much longer than the kit instructions say to, you can bottle a wine after 4 weeks, but it will taste young,acidic, possible bitter and so on, like most reds, you need to age it 6 months to a year at the least, plus, I can taste the funky kit taste in every kit wine that I've tasted, I've made several of the top of the line Eclipse kits, although others have said that they are ok, I just can't get past the kit taste, even after 2 years of aging.
If I could make a suggestion, I'd purchase a Malbec juice bucket and make a better wine, it is a bit more work, kits are balanced by the manufacturer, they come with a step by step instruction with everything you'll need to add included, with the juice buckets, you will decide what you'll add, and when; this is a great step towards making wine from fresh grapes, and to be honest, the cost isn't too far apart, I purchased enough Malbec grapes to make a 6 gal carboy and spent $129.00, the high end Eclipse kits cost over $150.00 -$175.00.
I'd be happy to walk you through the process.
Tom