This information is here so that you can make an informed decision as to what custom content goes into your game. We all know that an object's poly count can effect how the game runs. Some may be able to use the objects listed here with no problems while others experience severe lag or crashing with them. It's all subjective to what kind of computer you have and how it runs the game. Remember, the number of tiles an item is along with it's function in game do matter. A 5k poly deco vase (1 tile) that you use once on a lot may be fine for your computer to handle while a 5k poly counter (1 tile) that you use multiple times on a lot may not be. I've marked the items below as high poly based on the 800-1000 poly per tile Maxis stated long ago as the benchmark.

I've run these files through SimPE's mesh scanner and this is what it spit out at me...

Mango Opera set cushions (1 tile) : V 6025 F 10082
Mango Milord set tray (1 tile) : V 15698 F 28804
Jonesi September Sofa (3 tiles) : V 8337 F 10082
Jonesi September Chair (1 tile) : V 6003 F 6144
Solander K-Set01 Messageboard (1 tile) : V 9776 F 12910
ReflexForum AngelamvEliza Clock Window (2 tile) : V 14256 F 16096
Stylist Sims Montreal Plant (1 tile) : V 23258 F 24488
Bella's Birthday Gift to Mira Dining Chair (1 tile) : V 3393 F 5174
Sasilia Mondo Kitchen Counter 1a (1 tile) : V 6326 F 5205
Sasilia Mondo Kitchen Counter 2 (1 tile) : V 6566 F 5325
Sasilia Dining Free Ceiling Lamp (1 tile) : V 4282 F 5484
Sasilia Newport Living Sofa (3 tiles) : V 3783 F 6092
KansasCityRose Pottery Barn Kitchen Counter with Drawers (1 tile) : V 6156 F 5795
KansasCityRose Pottery Barn Bathroom Cabinet (1 tile) : V 1964 F 6454
KansasCityRose Pottery Barn Bathroom Counter 1 (1 tile) : V 4816 F 7148
KansasCityRose Pottery Barn Bathroom Counter 2 (1 tile) : V 5994 F 8412
KansasCityRose Pottery Barn Dining Room Candelier (1 tile) : V 4664 F 6544
Sims Design Ave Arcan Set Wall Candles (1 tile) : V 3851 F 5954
Sims Design Ave Campagne Childs Room Dresser (2 tile) : V 6862 F 6444
Sims Design Ave Campagne Living Room Table Lamp (1 tile) : V 4720 F 7788
Sims Design Ave Campagne Bedroom Dresser (2 tile) : V 6332 F 7944
Wall Sims Angel Bottle of Wine (1 tile) : V 3634 F 6494
SimSecrets Newport Living Candles (1 tile) : V 5500 F 7302
SimSecrets Newport Dining Lighthouse Lamp (1 tile) : V 6013 F 8080
Birgit43 Set Laufen Fountain (1 tile) : V 3733 F 7400

Sherry's Cinnamon Dining Room Shelf (2 tile) : V 6426 F 9280

Added 4/1/08:
Sims Design Avenue Mymetis Cosy Furniture
Bookcase sans FreeTime (1 tile) : V 2180 F 2176
Buffet (2 tile) : V 3024 F 3566
Chair (1 tile) : V 3509 F 3834
Grand Buffet (2 tile) : V 7218 F 8618
TV sans FreeTime (1 tile) : V 2139 F 2260
Chess Table (1 tile) : V 2139 F 2260
Dining Table (1 tile) : V 2336 F 3546
Dining Table (2 tile) : V 2402 F 5306
Side Table (1 tile) : V 3638 F 5170
Coffee Table (2 tile) : V 6114 F 8362
Stool (1 tile) : V 3119 F 4782

Screenie of Sims Design Ave (Caravan Sims) Campagne Kitchen poly count:



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Feel free to add any high poly info you have on custom content. If you list information, make sure it's verified info (ie you ran the mesh through SimPE or another program that will tell you the poly count) because I'd like people to be able to use this list to make an informed decision about what custom content to put in their game. 

Also, be advised that in order to keep the poly count information shared in this thread in an easy to use format any extraneous chatter will be removed. If you want to chatter about the list please do so in this thread. Don't be surprised if you find later that your post is gone.
Just to clarify since it seems some clarity is needed. The above statement means that posts made in this thread will be combined, edited, and/or removed without notice to keep the poly count information here in an easy to browse format. Thank You.