CSL MI-410 got buggy stock ROM if Im not mistaken, better dun buy since u will use it long term. Somemore CSL only rebadge those cheapo china phones.

1 question, are u the type that will root the phone and all that?

If not, galaxy ace will suit u well. The main issue Im facing now (Im using 1) is the unlock lag, other users face this too but very little lag only (non-stock launcher, stock 1 laggier). Mine is kinda bad, even lasts a couple of secs after unlock. Probably some apps caused it, not too sure. But it can be solved by using a custom ROM I guess.

Or top up and get huawei ideos x5

For 2nd hand, can look at used SE xperia x10.

AP sets are not that recommended since the price difference of ori and AP are kinda little. AP sets are warrantied by AP company, ori sets are warrantied by official distributers.

Ori - Pay more now, future worry less
AP - Pay less now, future worry more

We recommend ori as many people got bad experience with AP warranty.

X10 got good camera and better than ace, but 2nd hand though.

Mini pro is ok apart from the small screen.

Galaxy ace is ok for simple use. Since u gonna flash ROM, that would make it better but still not as good as x10, x5 or mini pro

U choose

Oh ya, X5's camera not that good for a 5MP

i vote for mini pro(SE xperia mini pro)