domain name system - Changing DNS records when Moving a site

I'm building a new Magento website on a Amazon ec2
instance and will need to point domain of their old OSCommerce site to the new ec2
instance's elastic IP address.

Normally I would
have though this a simple task of updating the A record of
their domain, but when I logged into the account with their register I see
they have 90 records set up already, mostly
CNAME & A records.

They have no IT guy to ask, but I'm almost 100%
sure what I need to do but as I normally work with web dev stuff like php and javascript
etc I just want to make sure I have it right.

To
give you a sample of their DNS records they have set
up:

Type Host Data TTL Kind State
            In Synch
A intweb1.their-domain.com 19?.??.???.OLD 3600 Manual  Active
            yes

CNAME intweb.their-domain.com intweb1.their-domain.com 3600
            Manual  Active yes
CNAME www.their-domain.com intweb1.their-domain.com 3600
            Manual  Active yes
A fs.their-domain.com 19?.??.???.OLD 3600 Manual  Active
            yes
CNAME fileserver.their-domain.com fs.their-domain.com 3600 Manual  Active
            yes

I believe I only
need to
REMOVE:

A
            intweb1.their-domain.com 19?.??.???.OLD 3600 Manual  Active
            yes

AND
CHANGE:

CNAME
            www.their-domain.com intweb1.their-domain.com 3600 Manual  Active
            yes

TO:

A
            www.their-domain.com 19?.??.???.NEW 3600 Manual  Active
            yes

AND
ADD ANOTHER
RECORD:

CNAME
            their-domain.com www.their-domain.com 3600 Manual  Active
            yes

Is this
correct?

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