Your collection is impressive I must say, and I can relate to the cost of models. I've only very recently purchased a set of coaches because new they were €56 (~£50 at the time, though closer to £42 from certain retailers), having held off over year after they were released a full set came to around £23 per coach roughly which is reasonable enough considering the general scarcity of Irish stock and the small runs of such information comparison to British stock.I started converting my railway from DC to DCC in July. I had 60+ locos back then, but found all of the steam bar one DCC ready loco couldn't be converted.
So far I have bought or converted 31 locos and still have 10 not suitable for conversion, the oldest being Hornby Dublo. I am mainly modelling modern GWR (including for steam charters), plus anything Southern DC. I still have some locos rarely or never seen on these regions, that will go eventually.
I have 08/10/11/24/25/31/37/40/42/47/50/52s/56/59/60/73/86/92/MPV + 101/110/156/170/220/HSTs/395/401/402/403/423/450/466 + some steam locos of which only 71000 can stay
Yes I buy what I like. For steam, that is locos that look good. I plan to get a Garratt, Battle of Britain, LNER P2, W1, Silver A4, but only those I can get at a reasonable price. My philosophy is to have a long wish list and only buy what comes up for an affordable price. I'd love a Paddington class 800, but not for £500+ and S Stock but not for £1000.