I am currently using a Spark HG659b modem with a D-Link DAP 1650 extender. The modem is now dropping out virtually every day which is a right pain and I really would like to update it with something superior! We only have ADSL available....what would be a good replacement modem and/or mesh system to go for? The house is 3 bedroom, has gib walls, single level. Would appreciate any suggestions.