A quick summary of the versions! Essentially there are only 3 FPGAs currently shipping. 02,04 and 08. Then there are a selection of cores (Retronics sells them by core) which can fit on any FPGA big enough, though technically as long as the FPGA has enough space it can fit any core. 

FGPAs	Logic elements	Block ram	Usable flash	Cost FPGA only (digikey) USD	 	 	 	 
10M02	2304	12 	N*	7.11	 	 	 	 	 	 
10M04	4032	21 	Y	9.63	 	 	 	 	 	 
10M08	8064	42 	Y	11.16	 	 	 	 	 	 
10M16	15840	61 	Y	27.36	 	 	 	 	 	 
*Flash controller takes 50% of space! Settings are volatile without flash	 	 	 	 	 	 	 
 	 	 	 	 	 	 	 	 	 	 
Core code	Name	Pokeys	PSGs	SIDs	Covox	Sample	U1MB	GTIA in	CS	1LE
MO	Mono	1	0	0	0	0 	N	Y	N	1500
SA	Stereo	2	0	0	0	0 	N	Y	N	2000
SU	Stereo U1MB	2	0	0	0	0 	Y	Y	N	2000
SX	Stereo XEL	2	0	0	0	0 	N	Y	Y	2000
SC	Stereo Covox	2	0	0	1	0 	N	Y	N	2300
QA	Quad	4	0	0	0	 0 	N	Y	N	3500
QC	Quad covox	4	0	0	1	0 	N	N	N	3600
QM	Quad sample	4	0	0	1	1 	N	N	N	4600
QS	Quad sid	4	0	2	0	0 	N	N	N	6600
QP	Quad psg	4	2	0	1	1 	N	N	N	5500
HK	Private dev!	4	2	2	1	1 	N	N	N	8000
Flash support was added to the core in 1.14 (10M08) and 1.15 (10M04)

The versions are:

•	mono: MO
o	EXT1:?, EXT2: ?, EXT3: ?

•	stereo_covox_auto: SC
o	EXT1:A4, EXT2: A7, EXT3: GTIA AUDIO
•	stereo_covox_sample_auto: SC *
o	EXT1:A4, EXT2: A7, EXT3: GTIA AUDIO
•	stereo_u1mb_auto: SU
o	EXT1: A4, EXT2: SWITCH, EXT3: GTIA AUDIO
•	quad_auto: QA
o	EXT1: A4, EXT2: A5, EXT3: GTIA AUDIO
•	quad_covox_auto: QC
o	EXT1: A4, EXT2: A5, EXT3: A7
•	quad_covox_sample_auto: QC *
o	EXT1: A4, EXT2: A5, EXT3: A7
•	quad_psg_covox_sample: QP
o	EXT1: A4, EXT2: A5, EXT3: A7
•	quad_sid: QS
o	EXT1: A4, EXT2: A5, EXT3: A6
•	fullv2: HK **
o	EXT1: A4, EXT2: A5, EXT2: A6, CS1 (cut pin): A7  
*08 version has room for sample player + covox, 04 only covox.
**developers only. Users should get v3 to use all chips, which is now available for pre-order here