Hi Bishvabis and Welcome to SCF Community.
Your lap have very good performance and, Yes, that is very important for "new" AV-s since some of them are very "heavy" for "weak and older" PCs.
My first recommendation is to try FREE Avira AV:
http://scforum.info/index.php/topic,208.0.html I'm sure you'll be more satisfied with them than with some AV which cost under $30.
My second advice, in case that you don't like Avira or some other FREE AV (Avast, AVG or Panda):
http://scforum.info/index.php/board,10.0.html , is to spend few more bucks and buy some well know AV like: Kaspersky, NOD32, BitDefender or McAfee.

Hope these suggestions will help You??
Also, please don't forget to provide us your experience with tested products and final decision.
Best Regards,
S.