Hi Mobilman,
I, like you am also returning after about 15 years or a little more. This time I actually have the ability of expanding my collection through purchases unlike my childhood where I depended on the generosity of older collectors :)
Concerning your question on stamp pricing:
Firstly, like you I am also in awe when I see a stamp or even better a block from the 19th century or early 20th century that is in mint condition.
Anyway, back to the subject. As you only are interested in Mint stamps of US you must be prepared to shell out more especially for the older stamps. I would say mint stamps on a minimum can cost 10-20 times more than the same stamp used or even more.
If I were you I would absolutely avoid Mystic and Stanley Gibbons (SG) unless you really really need / want something and you can't find it on
ebay or through any other sellers online. As for catalogue pricing, as someone else already pointed out, it is more like a price list for stamp dealers. (Mystic, SG, other regular dealers)
Here are a few options:
1. Check
ebay all the time (It pays to have a scott catalogue for the US on hand to check your pricing). By rule of thumb I would not pay for anything more than 20-30% of Catalogue Value on
ebay, unless it was exceptionally rare and didn't pop up all the time. (So if catalogue values it at $ 1, I would not pay more than 30 cents)
2. Join a stamp club where you can share with other collectors (a lot more sincere and honest than dealers)
3. Be more active on this forum, there are folks here who auction stuff regularly that you might need.
4. Visit your local stamp dealers, forge some relationships so he charges you less for your stuff.
ebay is the best gauge for prices.
If in the case you are going to spend a large amount on your collection, I would keep a track of all purchases and maintain a record of all prices you paid. So in the case you want to get rid of it, you know the minimum you should pay.
Another thing, I would not be too picky for a mint older stamp. If you come across a nicely centered, good condition used, do not hesitate, it could act as a space filler and make it easy on your pockets too :)
I am only focused on Queen Victoria era stamps for the time being so this is what I have done.
I bought an old Scott Catalogue for $ 5.00 from a dealer in order to trace the stamps I am looking for by scott numbers. I use
ebay and other sites to look up price as Scott prices are too good to be true.
I went down to the dealer today and his prices for some of his stamps were outrageous. Hence, why I have decided to stay on
ebay and that too on very very affordable bids. Once my collection reaches a decent amount of stamps and I am missing the more rarer stamps I will be ready to shell out some more.
Anyway, enough of this long boring post. Good luck with your collection!