Specifically price related.
We are moving to Brighton. Need a 3-4 bed family home and have viewed several recently. We offered 405k on a 450k 3 bed semi (Brighton - house prices are insane). Got flat out refused without counter offer. It has been on the market for 9 months...
Never mind, we found another one for 450k, 4 beds this time. We really like it but how low do we go? Houses seem to be on for months as a rule which leads me to think they are overpriced, but sellers don't seem too happy to accept less. This particular one has only been on for a month and I want to toe the fine line between not overpaying but not pissing the seller off either... won't post link sorry 
similar ones in and around the same street vary from 385k (though these tend to not be as nice/need some work doing) to 570k which is laughable really...
Our situation: have to sell our own house (priced to sell, we don't want to mess about) which has only just gone on the market, and we have a mortgage agreement in principle.
Help!