data size and system requirement

[RNA-seq]

I am moving from RNA-seq into whole genome DNA sequencing and wondering how big is the file? Illumina fastq file, SOLiD csfasta file as well as the aligned result in sam and bam format. What would be my minimum system requirement to deal with this kind of data then?
your help is really appreciated

[visivas]

If you are using the HiSeq instrument you approximately get about 100 M reads. Combine that with 100 PE you can approximately 32 Gigs worth of fastq files for each lane (uncompressed). Compression is about 50%.