It depends on who the insurer is re excess etc.
Some insurers will give vouchers, sometimes they will cash settle (vary rare) others have service suppliers who will collect the laptop, look to repair it. They then confirm if it is Beyond Economical Repair. If so they will recommend and supply the replacement. You should be able to negotiate with them for anythng else you want i.e desk top / tower. You could even try for a cash settlement at this stage however the insurer will probably only offer the amount they would have paid their service supplier (Insurers get great discounts due to volume of business).
Its worth remebering that the insurer has to indemnify you so they cannot give you anything that is inferior to you existing machine and as computers progress in technology so quickly, you will probably end up with a decent upgrade.
If they ask you for a contribution, refuse.
Hope this helps
Rik