plasmid drawing program

[cdt2 at PO.CWRU.EDU]

Can anybody recommend a plasmid construction program which allows one to
cut and splice various pieces together, make deletions etc and keep track
of restriction sites, sequence, etc. so that maps can be easily drawn, 
restriction fragment size predicted, and all the data stored? I need a PC-based
program. Windows would be nice.

Looking forward to advice.

Chris Town