Weapon Table

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Comparable table of Weapons (ATK +)
The table show the ATK+ of which weapon, for a few upgraded levels.
We can conclude that the color is most important quality for a weapon after a few upgrades.
Or for all upgrade calculations try here.
Weapon - White 	1-I	1-VI	2-I	2-VI	3-I	3-VI	4-I	4-VI	5-I
Cooper Sword lvl.1 	21 	71 	121	171 	221	271 	321	371 	421
Cooper Spear Lv.3 	24 	74 	124	174 	224	274 	324	374 	424
Iron Sword Lv. 4 	25 	75 	125	175 	225	275 	325	375 	425
Iron Spear Lv. 8 	28 	78 	128	178 	228	278 	328	378 	428
Iron Bow Lv.12 	30 	80 	130	180 	230	280 	330	380 	430
Silver Sword Lv 17 	35 	85 	135	185 	235	285 	335	385 	435
Silver Spear Lv 21 	40 	90 	140	190 	240	290 	340	390 	440
Silver Bow Lv 25 	45 	95 	145	195 	245	295 	345	395 	445
Silver Glaive Lv 29 	50 	100 	150	200 	250	300 	350	400 	450
Gold Sword Lv. 34 	55 	105 	155	205 	255	305 	355	405 	455
Gold Spear Lv. 38 	60 	110 	160	210 	260	310 	360	410 	460
Gold Bow Lv 42 	65 	115 	165	215 	265	315 	365	415 	465
Gold Glaive Lv. 46 	70 	120 	170	220 	270	320 	370	420 	470
Gold Axe Lv.51 	75 	125 	175	225 	275	325 	375	425 	475
Weapon - Green 	1-I	1-VI	2-I	2-VI	3-I	3-VI	4-I	4-VI	5-I
Chilled Sword Lv.12 	32 	97 	162	227 	292	357 	422	487 	552
Gold Hammer Lv.17 	37 	102 	167	232 	297	362 	427	492 	557
Asura Lv.17 	40 	105 	170	235 	300	365 	430	495 	560
Defiant's Spear Lv.21 	42 	107 	172	237 	302	367 	432	497 	562
Tempest Caller lv. 22 	44 	109 	174	239 	304	369 	434	499 	564
Dragon's Tongue Lv.25 	47 	112 	177	242 	307	372 	437	502 	567
Warmonger's Blade Lv. 29	52 	117 	182	247 	312	377 	442	506 	572
Warrior's Sword Lv.34 	57 	122 	187	252 	317	382 	447	512 	577
Bonepierce Lv.38 	62 	127 	192	257 	322	387 	452	517 	582
Shootting Star Lv. 39 	64 	129 	194	259 	324	389 	454	519 	584
Militant's Sword Lv.42 	67 	132 	197	262 	327	392 	457	522 	587
Assassin's Sword Lv.46 	72 	137 	202	267 	332	397 	462	527 	592
Weapon - Blue 	1-I	1-VI	2-I	2-VI	3-I	3-VI	4-I	4-VI	5-I
Slayer's Glaive Lv. 25 	49 	129 	209	289 	369	449 	529	609 	589
The Twins Lv. 31 	56 	136 	216	296 	376	456 	536	616 	696
Willow Leaf Lv.38 	64 	144 	224	304 	384	464 	544	624 	704
Ominous Glaive LV. 46 	74 	154 	234	314 	394	474 	554	634 	714
Howling Spear Lv. 51 	78 	158 	239	318 	398	478 	558	638 	718
Heartthrust Lv. 63 	85 	165 	245	325 	405	485 	565	645 	725
Vicious Spear Lv. 68 	90 	170 	250	330 	410	490 	570	650 	730
Lightning Lv. 72 	95 	175 	255	335 	415	495 	575	655 	735
Weapon Yellow 	1-I	1-VI	2-I	2-VI	3-I	3-VI	4-I	4-VI	5-I
Red Snake Lv. 29 	54 	154 	254	354 	454	554 	654	754 	854
Scud Lv. 38 	66 	166 	266	366 	466	566 	666	766 	866
Roaring Tiger Lv.51 	80 	180 	280	380 	480	580 	680	780 	880
Throwing Knife Lv.59 	85 	185 	285	385 	485	585 	685	785 	885
Green Devil Lv. 68 	90 	195 	295	395 	495	595 	695	795 	895
Weapon Red 	1-I	1-VI	2-I	2-VI	3-I	3-VI	4-I	4-VI	5-I
Feral Axe Lv. 46 	78 	198 	318	438 	558	678 	798	918 	1038
Starfish Lv. 55 	84 	204 	324	444 	564	684 	804	924 	1044
Icy Agony Lv. 59 	88 	208 	328	448 	568	688 	808	928 	1048
Roaring Lion Lv. 63 	93 	213 	333	453 	573	693 	813	933 	1053
Razorlight Lv. 68 	98 	218 	338	458 	578	698 	818	938 	1058
Hatred Flame Lv. 72 	104	224 	344	464 	584	704 	824	944 	1064
Weapon Purple 	1-I	1-VI	2-I	2-VI	3-I	3-VI	4-I	4-VI	5-I
Cursed Sword Lv. 63 	95 	235 	375	515 	655	795 	935	1075	
1215
=====Table by Hardiv=====