what's the best drainage system for a basement? is it even necessary?

[Guest guest]

several years ago, i lived in a duplex apartment that had inadequate drainage.

the basement flooded 6 times in a month period due to flash floods, pipes

breaking etc. needless to say, i got really sick from the mold growth.

i am now in the process of buying a house. according to the owners who have

lived there for 27 years, the basement was flooded once due to heavy

precipitation. there is a minor leak on one wall which has been cause by a

missing gutter from the upper roof and a short drainage pipe. this will be fixed

immediately. otherwise, moisture levels were all within acceptable levels.

i had basement systems evaluate the basement and they recommended their triple

safe sump pump and water guard drainage system. it will cost around 5k for

equipment and installation. considering the circumstances and the fact that what

i'm looking for is a drainage system for emergency flooding, does this drainage

system sound like a good idea?

did anyone actually use basement systems? if so, what was your experience?

thank you scott for your suggestions. i'm just looking for more opinions.

thanks!