Dell Studio 1558 equivalent laptop

The Studio range was discontinued I believe.

Its now the Inspiron or XPS range in the Home sector or the Latitude in the Work sector. The Vostro range in the Work sector was also discontinued. There are also the most expensive Dell ranges the Precision and Alienware.

The Work sector laptops usually come with a higher price tag but usually have far more support in the way of drivers and are usually built to a higher standard.

The Inspiron 15 might suit your purposes, hares one with the discrete graphics and i7, i5 respectively:

http://www.dell.com/in/p/inspiron-15-3521/fs?3x_nav=PROC_BRAND%3DCORE_I7_4%26VID_INTGRTN%3DN&3x_page=1&filterCollapsed=true

http://www.dell.com/in/p/inspiron-15-3521/fs?3x_nav=PROC_BRAND%3DCORE_I5_4%26VID_INTGRTN%3DN&3x_page=1&filterCollapsed=true

Also the Inspiron 15R with and without touch:

http://www.dell.com/in/p/inspiron-15r-5537/fs?3x_nav=PROC_BRAND%3DCORE_I7_4%26VID_INTGRTN%3DN&3x_page=1&filterCollapsed=true

And Inspiron 15 7000:

http://www.dell.com/in/p/inspiron-15-7537/fs

There is the Latitude E6540 but it seems to have no link to customise and buy:

http://www.dell.com/in/business/p/latitude-e6540-laptop/pd

Also watch out as the Latitude E6440 is not sold with Windows 7 when selected even though it states Windows 7, it in fact ships with Ubuntu:

http://www.dell.com/in/business/p/latitude-e6440-laptop/pd

http://www.dell.com/in/business/p/latitude-e6440-laptop/fs