Well, I went ahead and played slightly safer to avoid a bricc, going with 650/850. Reason is that I don't have a Teensy, nor a SYSCON reader/writer at the moment.
So far GTA5 has responded well, and am in process of getting Crysis HD as well.
I might also try Assassin's Creed 3 after Crysis.
LV1 string:
rsx: rsx65 a06 650/850 vpe:ff shd:3f [AP0018177:1:1:a:d:c:2:5:2][1c:0:2:0:1:2:0][2:1:0]
SYSCON log:
Firmware Version: 4.91 (build 50754)
Platform ID: CokG11
Product Code: 00 87
Product Sub Code: 00 09
Hardware Config: 000000000203BC3C
Syscon Firmware Version: 0832.00000000083E0832 (EEPROM: 00000000083E0832)
Bringup Count: 406, Shutdown Count: 390
Runtime: 24 Days, 17 Hours, 40 Minutes, 43 Seconds
Error Log
01: A0801200 Sat Jan 1 01:59:59 2000
02: A0801200 Sat Jan 1 01:59:59 2000
03: A0801200 Sat Jan 1 01:59:59 2000
04: FFFFFFFF Sat Jan 1 01:59:59 2000
05: FFFFFFFF Sat Jan 1 01:59:59 2000
06: FFFFFFFF Sat Jan 1 01:59:59 2000
07: FFFFFFFF Sat Jan 1 01:59:59 2000
08: FFFFFFFF Sat Jan 1 01:59:59 2000
09: FFFFFFFF Sat Jan 1 01:59:59 2000
10: FFFFFFFF Sat Jan 1 01:59:59 2000
11: FFFFFFFF Sat Jan 1 01:59:59 2000
12: FFFFFFFF Sat Jan 1 01:59:59 2000
13: FFFFFFFF Sat Jan 1 01:59:59 2000
14: FFFFFFFF Sat Jan 1 01:59:59 2000
15: FFFFFFFF Sat Jan 1 01:59:59 2000
16: FFFFFFFF Sat Jan 1 01:59:59 2000
17: FFFFFFFF Sat Jan 1 01:59:59 2000
18: FFFFFFFF Sat Jan 1 01:59:59 2000
19: FFFFFFFF Sat Jan 1 01:59:59 2000
20: FFFFFFFF Sat Jan 1 01:59:59 2000
21: FFFFFFFF Sat Jan 1 01:59:59 2000
22: FFFFFFFF Sat Jan 1 01:59:59 2000
23: FFFFFFFF Sat Jan 1 01:59:59 2000
24: FFFFFFFF Sat Jan 1 01:59:59 2000
25: FFFFFFFF Sat Jan 1 01:59:59 2000
26: FFFFFFFF Sat Jan 1 01:59:59 2000
27: FFFFFFFF Sat Jan 1 01:59:59 2000
28: FFFFFFFF Sat Jan 1 01:59:59 2000
29: FFFFFFFF Sat Jan 1 01:59:59 2000
30: FFFFFFFF Sat Jan 1 01:59:59 2000
31: FFFFFFFF Sat Jan 1 01:59:59 2000
32: FFFFFFFF Sat Jan 1 01:59:59 2000