New Practice - Which Software?

I've recently started my practice and was wondering what software I should be looking at and for recommendations. I intend to provide monthly and statutory accounts prep, CT returns, self assessment returns and VAT returns

I intend to buy an accounting package (Sage 50, Xero, etc), a year end accounts production package (e.g.: VT) and Self Assessment software (e.g.: TaxCalc). Should I also look at Corporation Tax software?

My clients will be SMEs or sole traders so I do not expect to be producing hugely complex accounts or tax returns. However I am keen to have the functionality to produce detailed management accounts and analysis on a monthly basis. Therefore I need an accounting package that includes features such as cost centres/departments, customised reporting, customised chart of accounts, etc. Also the functionality to upload journals, cash postings, etc from Excel/csv files is essential. I would much prefer a package that has integrated online VAT submission.

I have used Sage 50 before so was intending to go down that route, although it does seem quite expensive at £595 for five companies (£25 extra for five more companies, etc - up to £900 for 200 companies). I have also had a play with VT Cashbook but this looks like it's fine for preparing accounts for compliance purposes but is very limited for management information.

Any thoughts are much appreciated