Quick answer... I would go for Panzer Dragoon Saga. Long answer is below...
You seem to like the 32x. You could continue that or put the 400 toward basically every other 32x game besides Spiderman and go for that set.
This question is tough for me to answer, because I wouldn't go for any of those. My average game costs less than $5. I refuse to spend more than $20 on a game. $20 also has to be a fairly recent game that I really want to play. The last game I spent $20 on was Forza Horizon. I'm definitely a collector, but I've never collected exclusively expensive games. I actually most enjoy hunting down great games for cheap.
To better answer your question, are you merely collecting? looking for a good game? looking for the flavor of the week game? Basically what are your collecting goals?
If you are collecting, I would put that $400 into the previous generation. Now is the time to collect XBox, PS2 and Gamecube games. This is where a lot of collectors put their efforts.
If you are looking for a good game, I don't know if I would suggest any of those.
Another question that actually is pertinent, how long have you been collecting? What got you into collecting. Any system that is nostalgic?
GREAT POINT SIN2BETA. I SHOULD OF THOUGHT ABOUT GETTING ALL THE 32X GAMES OTHER THAN SPIDERMAN. HERE IS THE ANSWERS TO YOUR ALL OF YOUR EXCELLENT DETAILED QUESTIONS:
I ALWAYS LOVED THE CLASSICS AS A CHILD (SNES, NES, N64 ETC) AND LAST YEAR, I FOUND MOST OF MY SAME SYSTEMS I OWNED AS A KID IN STORAGE BOXES FROM MY MOMS. SO I BROUGHT ALL THOSE OUT AND STARTED PLAYING THEM AND REALIZED HOW MUCH I USED TO LOVE GAMES AND THEY MADE ME VERY HAPPY. AT THE SAME TIME, I NEEDED EXTRA MONEY FOR BILLS, SO I INVESTED SOME OF MY DREAMCAST AND GENESIS GAMES, SOLD THEM ON EBAY AND STARTED MAKING 500-700 A MONTH ON EBAY FOR BILLS. I THEN STARTED GOING TO MY LOCAL GOOD WILL WAREHOUSE A FEW TIMES A WEEK WHERE I WOULD FIND PS2 CONSOLES, PLAYSTATION 1, N64, NES, ETC THAT I BUY FOR 5.00 EACH. I WOULD SELL THEM ON EBAY FOR 30.00 TO 60.00 DEPENDING ON THE CONDITION AND TIMING. I BEGAN REALIZING THAT I WOULD FIND SO MANY SPORTS GAMES AT MY LOCAL GOOD WILL RETAIL STORES AND THE 1 THRIFT STORE I HAVE IN MY CITY. BUT ONLY SPORTS GAMES UNFORTUNATELY. AS I BEGAN LEARNING THE GOOD WILL AND THRIFT STORE SYSTEM AND MY LOCAL FLEA MARKET AND EBAY COMPETITION, I LEARNED THAT MANAGERS OF MY LOCAL THRIFT AND GOOD WILL STORES, HOLD BACK THE GOOD COMPLETE GAMES AND GREAT CONDITION SYSTEMS, TO SELL TO SELECT PEOPLE WHO PAY THEM BACK DOOR MONEY. AS A RESULT, I HAVE NO WAY OF GETTING ANY GREAT DEALS THIS WAY FOR CLASSIC GAMES. MY BEST BET IS TO GET LUCKY ON EBAY, AND THERE MAY HAVE BEEN ONLY 1 TIME THAT I GOT LUCKY ON A GAME AND THAT WAS NOT A BIG DEAL. JUST A N64 GAME NOT A SPORTS GAME. OTHER THAN THAT, ONLY SPORTS GAMES. SO I STILL CHECK STORES, BUT THE ODDS ARE EXTREMELY SLIM WHEN SOMEONE ELSE PAYS THE MGR TO HOLD BACK MERCHANDISE. SO HERE IN MY CITY, THAT IDEA IS OUT THE DOOR FOR ME. I COLLECT BECAUSE I LOVE GAMES AND THE PRESENCE MAKES ME HAPPY. FOR NES, I PICKED OUT A SELECT 30 GAMES OR SO ON A WISH LIST, SAME FOR SNES AND GENESIS. FOR N64, TURBOGRAFX 16, SEGA 32X AND SEGA CD ALONG WITH DREAMCAST, MY GOAL IS TO COLLECT ALL NTSC US GAMES RELEASED OFFICIALLY. THE REASON I BACKED OFF THE 32X FOR A MOMENT, WAS WHEN I REALIZED THAT NES GAMES ARE GETTING MORE SCARCE BY THE DAY SO IT MADE ME WANT TO COMPLETE MY WISH LIST FOR NES AND SNES FIRST, THEN GET BACK TO 32X AND THE OTHERS. THATS WHY I CREATED A PROFILE ON THIS SITE TO KEEP UP WITH ALL MY WISH LIST AND COMPLETED LIST. I ALSO HAVE A WORD DOCUMENT AND EXCEL TO KEEP ORGANIZED WHICH IS SAVED TO A FLASH DRIVE.
SO MY GOALS IS REALLY TO COMPLETE MY LIST, WHICH AT THE END, GIVES ME GREAT GAMES TO PLAY THAT I LOVE, AND TO HAVE CLASSICS AND RARE GAMES THAT MAY BE WORTH SOMETHING ONE DAY THAT I CAN SELL 50 YEARS LATER AND GIVE THE MONEY TO MY KIDS. I READ SOMETHING ABOUT PANZER DRAGOON SAGA ONLY HAD A CERTAIN AMOUNT OF COPIES RELEASED IN US, WHICH IS WHY I PUT IT HERE ON THE POST. OTHER THAN A LIMITED GAMECUBE AND XBOX GAMES, MY MAIN COLLECTING GOALS ARE FOR THE RETRO CONSOLES. MAY SOUND FUNNY BUT I HAVE NOT PLAYED AN XBOX SINCE 2005 AND ONLY PLAYED A 360 AND PS3 ONLY ONCE OR TWICE IN MY LIFE. I DO LIKE THE PANZER DRAGOON SAGA, BUT ALSO LIKE THE NES GAMES. I'LL FIGURE IT OUT THO BY THE END OF THE MONTH.