Best Specs
 

which player would you buy?

1.5 or 1.8?
3.1.?? 3.2.?? or 3.5.?? firmware ?
action or sigmatel chip (is it true sigmatel are better but action cheaper?)
battery 1.5v 2.0v 3.2v etc
fm or no fm
ctsn, oled, lcd, tft

Knowing what you know now since learning on this forum the nuances of each

1.8 TFT or LCD SCREEN - NO CSTN NO OLED SCREEN
ipod style case - The entire word "Menu" on scroll wheel, not just M
2gb or 2x2gb (4gb) samsung memory chip
Action Chipset - NO SIGMATEL
Firmware 3.5.?? Latest 3.5 version firmware
SD/MCC Slot
2.5v or 3.0v battery - highest capacity available

RedMonkey,
For me,
1.8 much better for video watching.

3.5.37 not much difference to the others but a little quicker.

Sigmatel provide better quality sound but are incompatible to the s1mp3 tools. To the best of my kowledge the firmware cannot be themed due to the lack of tools to do it. Thay also use SMV (Sigmatel Motion Video) format which does not offer such a good compression ratio and therefore files are larger.

3.2 Lithium Polymer Battery, good life span quick recharge more powerful for it's size than others.

FM may as well have it if you can get it.

TFT Brighter crisper image quality.

Not mentioned but 2GB Samsung Chip.

1. Tripper f100
FW: 3.5.35 Wilson co ltd. Actions Chipset, 512M
FM: Yes Battery: 1.5v TFT: 1.5 inch

2. hgPRO hg-158
FW: 3.5.35 hgPRO Actions Chipset, 512M
FM: Yes Battery: 3.6v TFT: 1.5 inch