Perplexing in determining packers

Being rather new to unpacking, I find it a bit confusing. I'm trying my hand at unpacking CDMA Workshop 3.7.5 and find the following:

PEiD shows UPolyX 0.3 by delikon *

Another scanner shows Themida 2.x

I'm leaning towards Themida because I see, when tracing the code, the following decrypt routine. EP at EC8000 stepping through I find:

00EC8046    55              PUSH EBP
00EC8047    89E5            MOV EBP,ESP
00EC8049    50              PUSH EAX
00EC804A    53              PUSH EBX
00EC804B    51              PUSH ECX
00EC804C    56              PUSH ESI
00EC804D    8B75 08         MOV ESI,DWORD PTR SS:[EBP+8]
00EC8050    8B4D 0C         MOV ECX,DWORD PTR SS:[EBP+C]
00EC8053    C1E9 02         SHR ECX,2
00EC8056    8B45 10         MOV EAX,DWORD PTR SS:[EBP+10]
00EC8059    8B5D 14         MOV EBX,DWORD PTR SS:[EBP+14]
00EC805C    85C9            TEST ECX,ECX
00EC805E    74 0A           JE SHORT cdma_wor.00EC806A
00EC8060    3106            XOR DWORD PTR DS:[ESI],EAX
00EC8062    011E            ADD DWORD PTR DS:[ESI],EBX
00EC8064    83C6 04         ADD ESI,4
00EC8067    49              DEC ECX
00EC8068  ^ EB F2           JMP SHORT cdma_wor.00EC805C

Then a few pushes and a RETN that goes to 00AB8000, and if tracing in Olly it crashes.

That's why I would think it Themida and not UPolyX. But I'm still a noob and figuring things out by trial and error. Any thought as to why PEiD might give a wrong packer? Bad signature database?

I should have mentioned the decrypt routine is between 00EC805C and 00EC8068. Not sure if that's just decrypting the unpack code, or what. I'll report back as I find more out.