asking for saddle advice is fruitless. everyone is different and for every saddle recommended there are people who think the same saddle is some kind of medieval torture device. personally a gel saddle makes me numb from my waist to my knees in about 30 minutes.
in my opinion testing out a saddle on an indoor trainer will also prove fruitless. every saddle makes me numb on an indoor trainer. also some saddles feel great for 30 minutes but 2 hours into a ride they can make you feel miserable. and other saddles feel painful for the first 15 minutes and then they feel comfortable thereafter.
take $500 out of your bank account. start buying saddles one at a time. you'll be lucky if you find one that you like before running out of money. after you buy your first saddle you might want to try the for trade thread at the top of this forum to find someone to swap saddles with.